Add workflow for generating GitHub Packages.

.github/workflows/docker-publish.yml

@@ -0,0 +1,118 @@
+# Create and publish a Docker image on github
+name: Create and publish a Docker image
+
+# Configures this workflow to run every time a change 
+# is tagged with a '-v' in between (e.g.: metastore-v1.0.0).
+on:
+  push:
+    # Publish `main` as Docker `latest` image.
+#    branches:
+#      - main
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+ #     - v*
+      - '*-v*'
+
+# Defines two custom environment variables for the workflow. 
+# These are used for the Container registry domain, and a 
+# name for the Docker image that this workflow builds.
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+# Two jobs for creating and pushing Docker image
+# - build-and-push-image -> triggered by commits on main and tagging with semantic version (e.g.: v1.2.3)
+# - build-and-push-image-of-branch -> triggered by tags matching '*-v*' (e.g.: Version_1-v1.2.3)
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    if: ${{ contains(github.ref_name, '-')  == failure() }}
+    # Sets the permissions granted to the `GITHUB_TOKEN` 
+    # for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      # Uses the `docker/login-action` action to log in to the Container 
+      # registry using the account and password that will publish the packages. 
+      # Once published, the packages are scoped to the account defined here.
+      - 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 }}
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+  build-and-push-image-of-branch:
+    runs-on: ubuntu-latest
+    if: contains(github.ref_name, '-')
+    # Sets the permissions granted to the `GITHUB_TOKEN` 
+    # for the actions in this job.
+    permissions:
+      contents: read
+      packages: write
+      # 
+    steps:
+      - name: Split first part 
+        env:
+          TAG: ${{ github.ref_name }}
+        id: split
+        run: echo "branch=${TAG%-v*}" >> $GITHUB_OUTPUT
+      - name: Test variable
+        run: |
+          echo ${{ steps.split.outputs.branch }}
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      # Uses the `docker/login-action` action to log in to the Container 
+      # registry using the account and password that will publish the packages. 
+      # Once published, the packages are scoped to the account defined here.
+      - 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-branch
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{steps.split.outputs.branch}}
+      # This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
+      # It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information, see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
+      # It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta-branch.outputs.tags }}
+          labels: ${{ steps.meta-branch.outputs.labels }}
+