Add github release workflow

.github/workflows/release.yml

@@ -0,0 +1,23 @@
+name: 'Release a new version to Github Packages'
+
+on:
+    release:
+        types: [published]
+
+jobs:
+    push_to_registry:
+        name: Push Docker image to GitHub Packages tagged with "latest" and version number.
+        runs-on: ubuntu-latest
+        steps:
+            - name: Check out the repo
+              uses: actions/checkout@v2
+            - name: Get the version
+              id: get_version
+              run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+            - name: Push to GitHub Packages
+              uses: docker/build-push-action@v1
+              with:
+                  username: ${{ github.actor }}
+                  password: ${{ secrets.CR_PAT }}
+                  registry: ghcr.io
+                  tags: latest,${{ steps.get_version.outputs.VERSION }}