Use ubuntu-act for non-build jobs and fix E2E backend probe

.gitea/workflows/cicd.yaml

@@ -1445,7 +1445,7 @@ jobs:
 
   production-images-complete:
     name: Production Images Complete
-    runs-on: ubuntu-act-8gb
+    runs-on: ubuntu-act
     needs: [build-backend-main-image, build-frontend-main-image, build-integration-tester-image, build-e2e-tester-image]
     if: always()
     timeout-minutes: 10
@@ -1476,7 +1476,7 @@ jobs:
     name: Runtime Images Failure Postmortem
     # Run on the broader runner pool so we can still capture diagnostics when
     # runtime_images fails during platform "Set up job" before any step executes.
-    runs-on: ubuntu-act-8gb
+    runs-on: ubuntu-act
     needs: [runtime_images, build-backend-main-image, build-frontend-main-image, build-integration-tester-image, build-e2e-tester-image]
     if: always() && (needs.runtime_images.result == 'failure' || needs['build-backend-main-image'].result == 'failure' || needs['build-frontend-main-image'].result == 'failure' || needs['build-integration-tester-image'].result == 'failure' || needs['build-e2e-tester-image'].result == 'failure')
     timeout-minutes: 10
@@ -1587,7 +1587,7 @@ jobs:
     name: Source Lanes Failure Postmortem
     # Capture follow-up diagnostics when any source lane dies during platform
     # setup before step logging is available.
-    runs-on: ubuntu-act-8gb
+    runs-on: ubuntu-act
     needs: [backend-tests, precommit-tests, frontend-tests, xdoctest]
     if: always() && (needs['backend-tests'].result == 'failure' || needs['precommit-tests'].result == 'failure' || needs['frontend-tests'].result == 'failure' || needs.xdoctest.result == 'failure')
     timeout-minutes: 10
@@ -1692,8 +1692,8 @@ jobs:
 
   integration-tests:
     name: Runtime Black-Box Integration Tests
-    # Pin integration tests to high-memory worker to reduce setup-stage runner churn.
+    # Use the broader runner pool; only docker build steps are 8gb-exclusive.
-    runs-on: ubuntu-act-8gb
+    runs-on: ubuntu-act
     timeout-minutes: 20
     needs: [build_cicd, production-images-complete, build-backend-main-image, build-frontend-main-image, build-integration-tester-image]
     steps:
@@ -1949,7 +1949,7 @@ jobs:
   e2e-tests:
     name: End-to-End Tests
     # Use ubuntu-act runner pool for consistent availability.
-    runs-on: ubuntu-act-8gb
+    runs-on: ubuntu-act
     timeout-minutes: 45
     needs: [build_cicd, production-images-complete, build-backend-main-image, build-frontend-main-image, build-integration-tester-image, build-e2e-tester-image]
     steps:
@@ -2042,18 +2042,18 @@ jobs:
               'import urllib.error' \
               'import urllib.request' \
               'endpoint_path = sys.argv[1]' \
-              'url = f\"http://127.0.0.1:8000{endpoint_path}\"' \
+              'url = f"http://127.0.0.1:8000{endpoint_path}"' \
               'try:' \
               '    with urllib.request.urlopen(url, timeout=2) as response:' \
-              '        body = response.read().decode(\"utf-8\", errors=\"replace\")' \
+              '        body = response.read().decode("utf-8", errors="replace")' \
               '        print(response.status)' \
               '        print(body)' \
               'except urllib.error.HTTPError as err:' \
-              '    body = err.read().decode(\"utf-8\", errors=\"replace\")' \
+              '    body = err.read().decode("utf-8", errors="replace")' \
               '    print(err.code)' \
               '    print(body)' \
               'except Exception:' \
-              '    print(\"000\")' \
+              '    print("000")' \
               '    print("")')" "${endpoint_path}"
             }