Update github-actions-builddockerfile.yml

.github/workflows/github-actions-builddockerfile.yml

@@ -26,9 +26,14 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/checkout@v3
+      - uses: docker/setup-buildx-action@v3
       -
         name: Build
         uses: docker/build-push-action@v5
         with:
+          context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           push: true
           tags: mccloud/subgen:latest