Add Edge Gateway tests for unit, API, and integration scenarios

.github/workflows/tests.yml

@@ -120,6 +120,52 @@ jobs:
         working-directory: services/edge-broker
         run: npm test
 
+  edge-gateway-backend:
+    name: Edge Gateway Backend (required)
+    runs-on: [self-hosted, Linux, X64, default]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Materialize compose env files
+        env:
+          COMPOSE_ENV: ${{ secrets.COMPOSE_ENV }}
+          COMPOSE_ENV_STAGING: ${{ secrets.COMPOSE_ENV_STAGING }}
+        run: |
+          set -euo pipefail
+          if [ -z "${COMPOSE_ENV}" ]; then
+            echo "Required GitHub secret COMPOSE_ENV is not configured." >&2
+            exit 1
+          fi
+          if [ -z "${COMPOSE_ENV_STAGING}" ]; then
+            echo "Required GitHub secret COMPOSE_ENV_STAGING is not configured." >&2
+            exit 1
+          fi
+          printf '%s\n' "$COMPOSE_ENV" > .env
+          printf '%s\n' "$COMPOSE_ENV_STAGING" > .env.staging
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Boot local stack
+        run: docker compose up -d traefik redis mysql-debug edge-broker php1 caddy
+
+      - name: Run edge gateway API tests
+        run: docker compose exec -T php1 sh -lc "cd /var/www/html && composer test:api:edge"
+
+      - name: Run edge gateway integration tests
+        run: docker compose exec -T php1 sh -lc "cd /var/www/html && composer test:integration:edge"
+
+      - name: Run edge gateway E2E smoke
+        run: node scripts/edge-gateway-e2e.mjs
+
+      - name: Tear down local stack
+        if: always()
+        run: docker compose down -v
+
   integration:
     name: Integration (advisory)
     runs-on: [self-hosted, Linux, X64, default]