Update test workflow to use docker-container driver

Author: dash14

.github/workflows/test.yml

@@ -35,12 +35,12 @@ jobs:
             proxy_mode: audit
             test_dockerfile: test/Dockerfile.audit
             assert_script: ./test/assert-audit-mode.sh
-            endpoint_port: 1234
+            builder_name: buildcage-audit
           - mode: restrict
             proxy_mode: restrict
             test_dockerfile: test/Dockerfile.restrict
             assert_script: ./test/assert-restrict-mode.sh
-            endpoint_port: 1235
+            builder_name: buildcage-restrict
 
     name: test (${{ matrix.mode }})
 
@@ -59,14 +59,14 @@ jobs:
       - name: Start containers
         env:
           PROXY_MODE: ${{ matrix.proxy_mode }}
-          PORT: ${{ matrix.endpoint_port }}
+          BUILDER_NAME: ${{ matrix.builder_name }}
         run: docker compose up -d --wait
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0
         with:
           driver: remote
-          endpoint: tcp://localhost:${{ matrix.endpoint_port }}
+          endpoint: docker-container://${{ matrix.builder_name }}
 
       - name: Build test image
         uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
@@ -84,11 +84,16 @@ jobs:
 
       - name: Show logs
         if: always()
+        env:
+          BUILDER_NAME: ${{ matrix.builder_name }}
+          INPUT_BUILDER_NAME: ${{ matrix.builder_name }}
         run: node report/main.mjs ./compose.yml || true
 
       - name: Run assertions
         run: ${{ matrix.assert_script }}
 
       - name: Cleanup
         if: always()
+        env:
+          BUILDER_NAME: ${{ matrix.builder_name }}
         run: docker compose down -v --rmi all 2>/dev/null || true