Add GitHub Action build on tag

.github/workflows/on-tag.yml

@@ -0,0 +1,97 @@
+name: Docker build on tag
+env:
+  DOCKER_CLI_EXPERIMENTAL: enabled
+  TAG_FMT: '^refs/tags/(((.?[0-9]+){3,4}))$'
+
+on:
+  push:
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+
+      - v[0-9]+.[0-9]+.[0-9]+-*
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    name: Build and push nodejs and whirlpool images
+    steps:
+      - name: Login to Docker for building
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Checkout project
+        uses: actions/checkout@v2
+
+      - name: Import environment variables
+        id: import-env
+        shell: bash
+        run: |
+          source ./docker/my-dojo/.env
+          echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+          echo "DOJO_NODEJS_VERSION_TAG=${DOJO_NODEJS_VERSION_TAG}" >> $GITHUB_ENV
+          echo "DOJO_WHIRLPOOL_VERSION_TAG=${DOJO_WHIRLPOOL_VERSION_TAG}" >> $GITHUB_ENV
+
+      - name: Show set environment variables
+        run: |
+          printf "    TAG: %s\n"  "$TAG"
+          printf "    DOJO_NODEJS_VERSION_TAG: %s\n"  "$DOJO_NODEJS_VERSION_TAG"
+          printf "    DOJO_WHIRLPOOL_VERSION_TAG: %s\n"  "$DOJO_WHIRLPOOL_VERSION_TAG"
+
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v1
+        with:
+          image: tonistiigi/binfmt:latest
+          platforms: all
+
+      - name: Setup Docker buildx action
+        uses: docker/setup-buildx-action@v1
+        id: buildx
+
+      - name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        id: cache
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Run Docker buildx against tag for dojo-node
+        run: |
+          docker buildx build \
+          --cache-from "type=local,src=/tmp/.buildx-cache" \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64,linux/arm64 \
+          --tag ${{ secrets.DOCKER_USERNAME }}/dojo-nodejs:$DOJO_NODEJS_VERSION_TAG \
+          --output "type=registry" \
+          --file ./docker/my-dojo/node/Dockerfile ./
+
+      - name: Run Docker buildx against latest for dojo-node
+        run: |
+          docker buildx build \
+          --cache-from "type=local,src=/tmp/.buildx-cache" \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64,linux/arm64 \
+          --tag ${{ secrets.DOCKER_USERNAME }}/dojo-nodejs:latest \
+          --output "type=registry" \
+          --file ./docker/my-dojo/node/Dockerfile ./
+
+      - name: Run Docker buildx against tag for dojo-whirlpool
+        run: |
+          docker buildx build \
+          --cache-from "type=local,src=/tmp/.buildx-cache" \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64,linux/arm64 \
+          --tag ${{ secrets.DOCKER_USERNAME }}/dojo-whirlpool:$DOJO_WHIRLPOOL_VERSION_TAG \
+          --output "type=registry" ./docker/my-dojo/whirlpool
+
+      - name: Run Docker buildx against latest for dojo-whirlpool
+        run: |
+          docker buildx build \
+          --cache-from "type=local,src=/tmp/.buildx-cache" \
+          --cache-to "type=local,dest=/tmp/.buildx-cache" \
+          --platform linux/amd64,linux/arm64 \
+          --tag ${{ secrets.DOCKER_USERNAME }}/dojo-whirlpool:latest \
+          --output "type=registry" ./docker/my-dojo/whirlpool