New container image build workflow

.github/workflows/container-image.yml

@@ -0,0 +1,70 @@
+#
+name: Build & publish TM backend container image
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+      - deployment/hot-tasking-manager
+      - deployment/demo-tasking-manager
+      - deployment/container-tasking-manager
+
+  pull_request:
+    branches:
+      - main
+      - develop
+      - deployment/hot-tasking-manager
+      - deployment/demo-tasking-manager
+      - deployment/container-tasking-manager
+
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: hotosm/tasking-manager-backend # was ${{ github.repository }}
+
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Setup Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in a subsequent step. The `images` value provides the base name for the tags and labels.
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+          tags: |
+            type=ref,event=tag
+            type=ref,event=branch
+            type=semver,pattern=raw
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}