diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
index d3b6e36..5acf277 100644
--- a/.gitea/workflows/ci.yaml
+++ b/.gitea/workflows/ci.yaml
@@ -63,11 +63,22 @@ jobs:
           path: services/acl/StrykerOutput/**/reports/mutation-report.html
           if-no-files-found: warn
 
-  # NOTE: there is deliberately no `integration` job here yet. `make integration`
-  # runs the ACL ↔ real-OpenZaak test locally / on a host-executing runner, but on
-  # the hosted runner a process on the runner cannot reach the stack's published
-  # ports (sibling containers — see gitea-actions-gotchas.md §5). Running it inside
-  # the compose network is tracked in #55.
+  integration:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: https://github.com/actions/checkout@v4
+      # No setup-dotnet: `make integration` runs the seed and the test as containers
+      # *inside* the OpenZaak compose network (reaching it by container IP), so dotnet
+      # lives in the test image and the runner needs only Docker. This sidesteps the
+      # runner being unable to reach published ports (gitea-actions-gotchas.md §5).
+      # Needs egress to pull base images + nuget + selectielijst.openzaak.nl.
+      - run: make integration
+      - name: dump OpenZaak logs on failure
+        if: failure()
+        run: docker compose -f infra/openzaak/docker-compose.yml logs --no-color --tail=80 oz-init openzaak 2>&1 || true
+      - name: tear down on failure
+        if: failure()
+        run: docker compose -f infra/openzaak/docker-compose.yml down --volumes 2>&1 || true
 
   compose-smoke:
     runs-on: ubuntu-latest
diff --git a/Makefile b/Makefile
index 21ee91b..8fde334 100644
--- a/Makefile
+++ b/Makefile
@@ -106,20 +106,14 @@ local-down:
 changelog:
 	git-cliff --output CHANGELOG.md
 
-## integration: ACL integration tests against a real OpenZaak (S-04a, #46). Brings
-## the stack up, seeds a PUBLISHED BIG zaaktype (OZ_PUBLISH=1, so OpenZaak accepts a
-## real zaak POST), runs the Integration-category tests, then always tears down.
-## Kept out of `unit`/`mutation` because it needs the live stack. See ADR-0006.
-integration: openzaak-up
-	@bash -c 'set -e; \
-	  for i in $$(seq 1 60); do \
-	    c=$$(curl -s -o /dev/null -w "%{http_code}" $(OZ_BASE)/catalogi/api/v1/ || true); \
-	    [ "$$c" = "200" ] && break; sleep 3; done; echo "OpenZaak ready ($$c)"; \
-	  OZ_PUBLISH=1 python3 infra/openzaak/seed_catalogus.py; \
-	  rc=0; dotnet test $(SLN) -c Release --filter "Category=Integration" || rc=$$?; \
-	  docker compose -f $(OZ_COMPOSE) down --volumes >/dev/null 2>&1 || true; \
-	  docker volume rm -f rr-oz-config >/dev/null 2>&1 || true; \
-	  exit $$rc'
+## integration: ACL integration tests against a real OpenZaak (S-04a, #46). The
+## seed and the test run inside the compose network (reaching http://openzaak:8000),
+## so this works on the hosted CI runner where a runner process can't reach the
+## stack's published ports. Brings the stack up, seeds a PUBLISHED BIG zaaktype,
+## runs the Integration-category tests, then always tears down. Kept out of
+## `unit`/`mutation` because it needs the live stack. See infra/run-integration.sh + ADR-0006.
+integration:
+	bash infra/run-integration.sh
 
 ## openzaak-up: start the OpenZaak stack (migrations run on first start)
 openzaak-up:
diff --git a/docs/architecture/adr-0006-integration-test-provisioning.md b/docs/architecture/adr-0006-integration-test-provisioning.md
index 5494736..2fd8e00 100644
--- a/docs/architecture/adr-0006-integration-test-provisioning.md
+++ b/docs/architecture/adr-0006-integration-test-provisioning.md
@@ -47,8 +47,9 @@ itself. No new test dependency is added.**
 - **The lane is kept out of the fast checks.** `make unit` runs with
   `--filter "Category!=Integration"`; Stryker is pinned to `Acl.Tests` (`test-projects`), so
   neither the unit nor the mutation lane needs a live stack. A new `make integration` target
-  brings the stack up, seeds, runs the lane, and always tears down. This matches `make` being
-  the single source of truth (ADR-0005).
+  (`infra/run-integration.sh`) brings the stack up, seeds, runs the lane, and always tears down
+  — mirrored by a Gitea Actions `integration` job. This matches `make` being the single source
+  of truth (ADR-0005).
 - **Publishing is opt-in in the seed.** `infra/openzaak/seed_catalogus.py` gains an
   `OZ_PUBLISH=1` path that adds the relations OpenZaak's publish requires — two statustypen
   (begin/eind), a roltype, and a resultaattype whose Selectielijst procestype is matched onto
@@ -70,12 +71,13 @@ itself. No new test dependency is added.**
   in production) but it is a network touchpoint, and a CI environment without egress would need
   a local Selectielijst service or a recorded fixture. `OZ_SELECTIELIJST` overrides the base URL.
 - **Cost:** the lane needs the stack up first, so it is separate from the fast lanes.
-- **Not yet a hosted-runner job.** `make integration` passes locally and on a host-executing
-  runner, but on Gitea's hosted runner a process *on the runner* cannot reach the stack's
-  published ports — Compose starts sibling containers via the host daemon, so the ports bind to
-  the host, not the runner (gitea-actions-gotchas.md §5, the same split as §1). Running the test
-  and seed *inside* the compose network (via a built image, not bind mounts) to gate it in CI is
-  tracked in **#55**. Until then the lane runs locally and is not a merge gate.
+- **Runs on the hosted runner.** A process *on* the runner can't reach the stack's published
+  ports (Compose starts sibling containers via the host daemon — gitea-actions-gotchas.md §5,
+  same split as §1), so `infra/run-integration.sh` runs both the seed and the test as containers
+  *joined to the OpenZaak network*, reaching it by **container IP** (a single-label host like
+  `openzaak` isn't URL-valid for OpenZaak's own `URLValidator`; an IPv4 literal is). Code is
+  delivered by image build / `docker cp`, never bind mounts. The CI job therefore needs only
+  Docker — no `setup-dotnet`. (This closed the follow-up that was originally split out as #55.)
 
 ## Alternatives considered
 
diff --git a/docs/runbooks/ci.md b/docs/runbooks/ci.md
index d925115..abd035e 100644
--- a/docs/runbooks/ci.md
+++ b/docs/runbooks/ci.md
@@ -17,13 +17,13 @@ and CI cannot drift:
 | `build` | `make build` → `dotnet build … -c Release` | .NET 10 SDK |
 | `unit` | `make unit` → `dotnet test … -c Release --filter "Category!=Integration"` | .NET 10 SDK |
 | `mutation` | `make mutation` → `dotnet tool restore` → `dotnet stryker` (ACL); uploads the HTML report as an artifact | .NET 10 SDK |
+| `integration` | `make integration` → `infra/run-integration.sh`: OpenZaak up → seed a **published** BIG zaaktype + run `Acl.IntegrationTests` **as containers inside the compose network** → tear down | container engine + egress (base images, nuget, `selectielijst.openzaak.nl`) |
 | `compose-smoke` | `make smoke` → seed config volumes → `up -d` (full stack) → `up --wait` durable services → `down` | container engine + compose v2 |
 
-> **`make integration` is not a hosted-runner job yet.** The ACL ↔ real-OpenZaak
-> test (`make integration`, ADR-0006) passes locally and on a host-executing runner,
-> but a process on the hosted runner can't reach the stack's published ports
-> (sibling containers — see [gitea-actions-gotchas.md §5](gitea-actions-gotchas.md)).
-> Run it inside the compose network to gate it in CI — tracked in **#55**.
+> **The `integration` job needs no `setup-dotnet`.** dotnet runs inside the test
+> image, and both the seed and the test join the OpenZaak network and reach it by
+> container IP — so the runner never has to reach a published port
+> (see [gitea-actions-gotchas.md §5](gitea-actions-gotchas.md)).
 
 All `uses:` references are absolute, tag-pinned URLs (`https://github.com/actions/checkout@v4`,
 `https://github.com/actions/setup-dotnet@v4`) per CLAUDE.md §8.7 and §15 — Gitea
diff --git a/docs/runbooks/gitea-actions-gotchas.md b/docs/runbooks/gitea-actions-gotchas.md
index 1967454..c9c9ae4 100644
--- a/docs/runbooks/gitea-actions-gotchas.md
+++ b/docs/runbooks/gitea-actions-gotchas.md
@@ -152,6 +152,8 @@ service by name (`http://openzaak:8000`). For a test/seed that needs the repo's
 code, deliver it via a **built image** (not a bind mount — §1), then
 `docker run --network <stack>_cg …`.
 
-**Status** — `make integration` (the ACL ↔ real-OpenZaak test, ADR-0006) therefore
-runs locally / on a host-executing runner only. Gating it on the hosted runner via
-the compose network is tracked in **#55**.
+**Applied** — `make integration` (the ACL ↔ real-OpenZaak test, ADR-0006) does
+exactly this: `infra/run-integration.sh` runs the seed and the test as containers on
+the OpenZaak network and reaches it by **container IP** (a single-label service name
+like `openzaak` isn't URL-valid — OpenZaak echoes the request host into the URLs it
+returns and then rejects them with Django's `URLValidator`; an IPv4 literal passes).
diff --git a/infra/run-integration.sh b/infra/run-integration.sh
new file mode 100755
index 0000000..c43fb25
--- /dev/null
+++ b/infra/run-integration.sh
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+#
+# Run the ACL ↔ real-OpenZaak integration test (S-04a / #46) end to end.
+#
+# Everything that talks to OpenZaak runs *inside* the compose network and reaches
+# it by service name (http://openzaak:8000) — the hosted CI runner can't reach the
+# stack's published ports (sibling containers) and bind mounts don't reach the
+# daemon either (gitea-actions-gotchas.md §1/§5). So we use only plain docker
+# primitives (run / create / cp / build) — portable across docker compose (CI) and
+# podman-compose (local), exactly like infra/seed-config.sh. See ADR-0006.
+#
+# Steps: bring OpenZaak up → wait for it healthy → seed a PUBLISHED BIG zaaktype
+# (a seed container on the network) → build + run the test container on the network
+# → always tear down.
+set -euo pipefail
+
+here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+root="$(cd "$here/.." && pwd)"
+OZ_COMPOSE="$here/openzaak/docker-compose.yml"
+
+cleanup() {
+  docker compose -f "$OZ_COMPOSE" down --volumes >/dev/null 2>&1 || true
+  docker volume rm -f rr-oz-config >/dev/null 2>&1 || true
+}
+trap cleanup EXIT
+
+echo ">> bringing OpenZaak up"
+bash "$here/seed-config.sh" oz
+docker compose -f "$OZ_COMPOSE" up -d
+
+echo ">> waiting for the OpenZaak API container to be healthy"
+# Match the API container under both docker compose (openzaak-openzaak-1) and
+# podman-compose (openzaak_openzaak_1) naming; the regex excludes oz-db / oz-redis.
+api=""
+for _ in $(seq 1 140); do
+  api="$(docker ps -q --filter 'name=openzaak[-_]openzaak' | head -1)"
+  if [ -n "$api" ]; then
+    status="$(docker inspect -f '{{if .State.Health}}{{.State.Health.Status}}{{end}}' "$api" 2>/dev/null || true)"
+    [ "$status" = "healthy" ] && break
+  fi
+  sleep 3
+done
+[ -n "$api" ] || { echo "ERROR: OpenZaak API container never appeared" >&2; exit 1; }
+[ "${status:-}" = "healthy" ] || { echo "ERROR: OpenZaak not healthy (status=${status:-none})" >&2; exit 1; }
+
+# The network the API container is attached to — joined by the seed + test below.
+net="$(docker inspect -f '{{range $k,$_ := .NetworkSettings.Networks}}{{$k}}{{"\n"}}{{end}}' "$api" | head -1)"
+# Reach OpenZaak by container IP, not by the service name. OpenZaak echoes its
+# request Host into the self-referential URLs it returns, then validates those URLs
+# with Django's URLValidator — which rejects a single-label host like `openzaak`
+# ("Voer een geldige URL in") while accepting an IPv4 literal (and `localhost`).
+oz_ip="$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$api")"
+oz_base="http://${oz_ip}:8000"
+echo ">> OpenZaak healthy on network $net at $oz_base"
+
+echo ">> seeding a published BIG zaaktype (OZ_PUBLISH=1, inside the network)"
+sid="$(docker create --network "$net" \
+  -e "OZ_BASE=$oz_base" -e OZ_PUBLISH=1 \
+  python:3-slim python /seed_catalogus.py)"
+docker cp "$here/openzaak/seed_catalogus.py" "$sid:/seed_catalogus.py"
+docker start -a "$sid"
+docker rm -f "$sid" >/dev/null
+
+echo ">> building the integration test image"
+docker build -f "$root/services/acl/Dockerfile.integration" -t rr-acl-integration "$root/services/acl"
+
+echo ">> running the integration tests (inside the network)"
+docker run --rm --network "$net" -e "OZ_BASE=$oz_base" rr-acl-integration
diff --git a/services/acl/Dockerfile.integration b/services/acl/Dockerfile.integration
new file mode 100644
index 0000000..969843d
--- /dev/null
+++ b/services/acl/Dockerfile.integration
@@ -0,0 +1,26 @@
+# Runs the ACL integration tests (Category=Integration) from *inside* the compose
+# network, so they reach OpenZaak at http://openzaak:8000 by service name. On the
+# hosted CI runner a process on the runner can't reach the stack's published ports
+# (sibling containers — gitea-actions-gotchas.md §5), so the test runs as a
+# container joined to that network instead. See ADR-0006 / #55.
+#
+# Build context is services/acl (like the service Dockerfile). dotnet lives in this
+# image, so the CI `integration` job needs only Docker — no setup-dotnet step.
+FROM mcr.microsoft.com/dotnet/sdk:10.0
+WORKDIR /src
+
+# Restore first (cached unless the .csproj files change). The integration test
+# project pulls in Acl.Application + Acl.Infrastructure via its ProjectReferences.
+COPY Acl.Application/Acl.Application.csproj Acl.Application/
+COPY Acl.Infrastructure/Acl.Infrastructure.csproj Acl.Infrastructure/
+COPY Acl.IntegrationTests/Acl.IntegrationTests.csproj Acl.IntegrationTests/
+RUN dotnet restore Acl.IntegrationTests/Acl.IntegrationTests.csproj
+
+COPY Acl.Application/ Acl.Application/
+COPY Acl.Infrastructure/ Acl.Infrastructure/
+COPY Acl.IntegrationTests/ Acl.IntegrationTests/
+
+# OZ_BASE is supplied at run time (the OpenZaak container IP — see run-integration.sh,
+# which passes `-e OZ_BASE=http://<ip>:8000`; a single-label host is not URL-valid).
+ENTRYPOINT ["dotnet", "test", "Acl.IntegrationTests/Acl.IntegrationTests.csproj", \
+            "-c", "Release", "--filter", "Category=Integration"]