hack at build not buildx

.github/workflows/docker-tag-triggered-prod.yml

@@ -9,60 +9,39 @@ jobs:
   gcr-dockerhub-build-publish:
     runs-on: ubuntu-latest
     steps:
-      -
-        name: Checkout
+      - name: Checkout
         uses: actions/checkout@v2
-      -
-        name: Set up QEMU
+      - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-      -
-        # TODO(#122): Remove step when https://github.com/actions/virtual-environments/issues/2658 fixed
+      - # TODO(#122): Remove step when https://github.com/actions/virtual-environments/issues/2658 fixed
         name: Update runc # https://github.com/actions/virtual-environments/issues/2698#issuecomment-779262068
         run: |
           sudo apt-get install libseccomp-dev
           git clone https://github.com/opencontainers/runc
           cd runc
           make
           sudo make install
-      -
-        name: Login to DockerHub
+      - name: Login to DockerHub
         uses: docker/login-action@v1 
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
-      -
-        name: Login to GitHub Container Registry
+      - name: Login to GitHub Container Registry
         uses: docker/login-action@v1 
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
           password: ${{ secrets.CR_PAT }}
-      -
-        name: Show Runners environment (debug)
+      - name: Show Runners environment (debug)
         shell: bash
         run: export
-      -
-        name: Identify GitHub tag name
+      - name: Build image
+        run: docker build .
+      - name: Identify GitHub tag name
         shell: bash
         # get tag name from runners environment 'GITHUB_REF' and then use bash substring
         # to strip out '+' symbol - required due to gcr not supporting this as a tag 
         # name (docker hub does support it).
         # note if push is NOT triggered by tag then 'GITHUB_REF' will be the branch name.
         run: echo "##[set-output name=tag;]$(tag_name=${GITHUB_REF#refs/tags/} && echo "${tag_name//+/-}")"
-        id: identify_tag
-      -
-        name: Build and Push to GCR and Docker Hub
-        uses: docker/build-push-action@v2
-        with:
-          context: .
-          file: ./Dockerfile
-          platforms: linux/amd64
-          push: true
-          tags: |
-            ${{ github.repository }}:latest
-            ${{ github.repository }}:${{ steps.identify_tag.outputs.tag }}
-            ghcr.io/${{ github.repository }}:latest
-            ghcr.io/${{ github.repository }}:${{ steps.identify_tag.outputs.tag }}
+        id: identify_tag