feat: docker hub build/push action

.github/workflows/dockerhub-build-push.yml

@@ -0,0 +1,53 @@
+name: 🐳 Docker Hub Build & Push
+
+on:
+  workflow_dispatch:
+  workflow_call:
+
+permissions:
+  actions: write
+  checks: write
+  contents: write
+  pull-requests: write
+  packages: write
+
+env:
+  NODE_VERSION: 20
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: ⇣ Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+          ref: ${{ github.event.pull_request.head.sha || github.ref }}
+
+      - name: 🏷️ Set Docker Image Tag
+        run: |
+          echo "PV=$(cat package.json | jq -r '.version')" >> $GITHUB_ENV
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: ⬢ Setup Node & Cache
+        uses: actions/setup-node@v4
+        with:
+          cache: "npm"
+          cache-dependency-path: package-lock.json
+
+      - name: ↧ Install
+        run: npm ci --verbose --foreground-scripts
+
+      - name: 🚢 Build Docker Builder
+        run: |
+          npm run --verbose --foreground-scripts init-docker-builder
+
+      - name: 🐳 Build & Push to Docker Hub
+        run: |
+          docker buildx build --push --platform linux/amd64,linux/arm64 -t backstopjs/backstopjs:$PV --build-arg BACKSTOPJS_VERSION=$PV docker