Refactor release CI process to use new Github Docker Registry

Github has launched the new Docker Registry which is better integrated
with Github Projects and the naming convention is less confusing. Also
the way GH Packages Docker publish was configured, that is deprecated in
the new version of build and push. So moving to the new registry is the
way forward.

Update the docker registry URL.

Signed-off-by: Imran M Yousuf <imyousuf@gmail.com>

.github/workflows/release.yml

@@ -69,26 +69,27 @@ jobs:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
+    -
+      uses: docker/login-action@v1
+      name: Login to Github Docker Registry
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.CR_PAT }}
+
     - name: Get the version
       id: get_version
       run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
 
     -
       uses: docker/build-push-action@v2
-      name: Push to Dockerhub
-      id: dockerhub_build_push
+      name: Push
+      id: build_push
       with:
         push: true
         tags: |
           imyousuf/webhook-broker:${{ steps.get_version.outputs.VERSION }}
-    - name: Push to GitHub Packages
-      uses: docker/build-push-action@v1
-      with:
-        username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
-        registry: docker.pkg.github.com
-        repository: imyousuf/webhook-broker/w7b6
-        tag_with_ref: true
+          ghcr.io/imyousuf/webhook-broker:${{ steps.get_version.outputs.VERSION }}
 
   helm_chart:
     name: Helm Chart Release

README.md

@@ -25,7 +25,7 @@ As part of the Terraform configuration, we deploy Webhook Broker using a [Helm C
 Our docker images are host in 2 repositories -
 
 1. [Docker Hub](https://hub.docker.com/repository/docker/imyousuf/webhook-broker)
-2. [Github Docker Registry](https://github.com/imyousuf/webhook-broker/packages)
+2. [Github Docker Registry](https://github.com/users/imyousuf/packages/container/package/webhook-broker)
 
 The difference being Docker Hub will have images for builds from `main` branch whenever a commit is pushed to the branch. Whereas Github registry will only contain releases. The distinction is made so that docker hub can be used for continuous deployment whereas Github Docker Registry for stable releases. The docker [compose file](https://github.com/imyousuf/webhook-broker/blob/main/docker-compose.integration-test.yaml) for integration test gives a good idea how about to setup an environment using docker images and how to configure it through volume mount.