add github action for integration tests

.github/workflows/integration.yml

@@ -0,0 +1,35 @@
+on:
+  push:
+
+jobs:
+  integration-tests:
+    strategy:
+      matrix:
+        db: [cockroach, postgres]
+    runs-on: ubuntu-20.04
+    env:
+      DOCKER_BUILDKIT: 1
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.19
+      - name: Source checkout
+        uses: actions/checkout@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          driver: docker
+          install: true
+      - name: Generate gRPC definitions
+        run: docker build -f build/grpc/Dockerfile -t zitadel-base:local .
+      - name: Copy gRPC definitions
+        run: docker build -f build/zitadel/Dockerfile . -t zitadel-go-base --target go-copy -o .
+      - name: Download Go modules
+        run: go mod download
+      - name: Start ${{ matrix.db }} database
+        run: docker compose -f e2e/config/integration/docker-compose.yaml up --wait ${{ matrix.db }}
+      - name: Run integration test
+        env:
+          INTEGRATION_DB_FLAVOR: ${{ matrix.db }} 
+        run: go test -tags=integration -v  ./internal/integration ./internal/api/grpc/...