ci: reuse backend setup and run tests on one runner

.github/workflows/tests.yml

@@ -22,35 +22,53 @@ jobs:
       - uses: astral-sh/setup-uv@v7
         with:
           version: ${{ env.UV_VERSION }}
-      - name: Run backend tests
-        env:
-          SUPERADMIN_LOGIN: dummy_login
-          SUPERADMIN_PWD: dummy&P@ssw0rd!
-          SUPERADMIN_ORG: dummyorga
-          POSTGRES_USER: dummy_pg_user
-          POSTGRES_PASSWORD: dummy_pg_pwd
-          POSTGRES_DB: dummy_pg_db
+      # Build while PostgreSQL and S3 download and become healthy.
+      - parallel:
+          - name: Start test services
+            run: docker compose -f docker-compose.dev.yml up -d --wait db localstack
+          - name: Build the test image
+            run: UV_GROUPS="server test" docker compose -f docker-compose.dev.yml build backend
+      - name: Create isolated test databases
         run: |
-          UV_GROUPS="server test" docker compose -f docker-compose.dev.yml up -d --build --wait
-          docker compose -f docker-compose.dev.yml exec -T backend pytest --cov=app --cov-report xml tests/
-          docker compose -f docker-compose.dev.yml cp backend:/app/coverage.xml ./coverage-src.xml
+          for shard in api remaining; do
+            docker compose -f docker-compose.dev.yml exec -T db createdb -U dummy_pg_user "dummy_pg_db_$shard"
+          done
+      # Share one runner; separate databases and container hostnames isolate DB rows and S3 buckets.
+      - parallel:
+          - name: Run slow API tests
+            run: >
+              docker compose -f docker-compose.dev.yml run --rm --no-deps -T
+              -e POSTGRES_URL=postgresql+asyncpg://dummy_pg_user:dummy_pg_pwd@db/dummy_pg_db_api
+              -e COVERAGE_FILE=/app/.coverage.api
+              backend sh -c 'alembic upgrade head && python app/db.py && exec "$@"' --
+              pytest -o cache_dir=/tmp/pytest-cache --cov=app --cov-report=xml:/app/coverage-api.xml
+              tests/endpoints/test_{detections,sequences,camera_proxy,temporal_validation}.py
+          - name: Run all remaining backend tests
+            run: >
+              docker compose -f docker-compose.dev.yml run --rm --no-deps -T
+              -e POSTGRES_URL=postgresql+asyncpg://dummy_pg_user:dummy_pg_pwd@db/dummy_pg_db_remaining
+              -e COVERAGE_FILE=/app/.coverage.remaining
+              backend sh -c 'alembic upgrade head && python app/db.py && exec "$@"' --
+              pytest -o cache_dir=/tmp/pytest-cache --cov=app --cov-report=xml:/app/coverage-remaining.xml
+              tests/ --ignore=tests/endpoints/test_{detections,sequences,camera_proxy,temporal_validation}.py
       - name: Run Telegram end-to-end check
         env:
           TELEGRAM_TOKEN: ${{ secrets.TELEGRAM_TOKEN }}
           TELEGRAM_TEST_CHAT_ID: ${{ secrets.TELEGRAM_TEST_CHAT_ID }}
         run: |
           if [ -n "$TELEGRAM_TOKEN" ] && [ -n "$TELEGRAM_TEST_CHAT_ID" ]; then
-            docker compose -f docker-compose.dev.yml exec -T -e TELEGRAM_TOKEN -e TELEGRAM_TEST_CHAT_ID backend pytest tests/services/test_telegram.py -v
+            docker compose -f docker-compose.dev.yml run --rm --no-deps -T -e TELEGRAM_TOKEN -e TELEGRAM_TEST_CHAT_ID backend pytest tests/services/test_telegram.py -v
           else
             echo "TELEGRAM_TOKEN / TELEGRAM_TEST_CHAT_ID secrets not set, skipping"
           fi
       - name: Stop the stack
         if: always()
+        background: true
         run: docker compose -f docker-compose.dev.yml down
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v7
         with:
-          files: ./coverage-src.xml
+          files: ./src/coverage-api.xml,./src/coverage-remaining.xml
           flags: backend
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true