Use per-job network for blackbox services

.gitlab-ci.yml

@@ -35,11 +35,24 @@ rails spec:
 
 rails e2e spec:
   stage: test
-  image: $CI_REGISTRY_IMAGE/production/commits:$CI_COMMIT_SHA
+  image: $CI_REGISTRY_IMAGE/test/commits:$CI_COMMIT_SHA
   services:
     - name: postgres:16
       alias: postgres
+    - name: $CI_REGISTRY_IMAGE/production/commits:$CI_COMMIT_SHA
+      alias: app
+      command:
+        - bundle
+        - exec
+        - rails
+        - s
+        - -p
+        - "3000"
+        - -b
+        - 0.0.0.0
   variables:
+    FF_NETWORK_PER_BUILD: "true"
+    CI_DEBUG_SERVICES: "true"
     POSTGRES_DB: turniere_blackbox
     POSTGRES_USER: turniere
     POSTGRES_PASSWORD: turniere
@@ -50,9 +63,9 @@ rails e2e spec:
     MAILGUN_DOMAIN: blackbox.example.com
     RAILS_LOG_TO_STDOUT: "1"
     RAILS_SERVE_STATIC_FILES: "1"
-    NO_PROXY: postgres,localhost,127.0.0.1
+    NO_PROXY: app,postgres,localhost,127.0.0.1
-    no_proxy: postgres,localhost,127.0.0.1
+    no_proxy: app,postgres,localhost,127.0.0.1
-    TURNIERE_E2E_BASE_URL: http://127.0.0.1:3000
+    TURNIERE_E2E_BASE_URL: http://app:3000
     TURNIERE_E2E_EMAIL: e2e@example.com
     TURNIERE_E2E_PASSWORD: password123
     TURNIERE_E2E_USERNAME: e2e-user
@@ -68,4 +81,4 @@ rails e2e spec:
     - when: always
   script:
     - cd /app
-    - inv blackbox-self
+    - inv blackbox-service

AGENTS.md

@@ -24,7 +24,7 @@ Examples:
 - `inv docker-test-http-e2e`
 
 The GitLab CI pipeline is expected to use these tasks as well.
-In CI, blackbox E2E should run from the production image with Postgres as the sidecar and should avoid Docker Compose inside the job.
+In CI, blackbox E2E should prefer the documented GitLab service-to-service model with `FF_NETWORK_PER_BUILD: "true"` when the production image needs to talk to a Postgres sidecar.
 The normal Rails spec suite is sharded through `inv test-shard ...` and should stay aligned with the CI matrix configuration.
 
 Useful GitLab push-option variables for saving CI minutes on public repos: