add release workflow (#145)

.github/workflows/release.yml

@@ -0,0 +1,41 @@
+name: release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Packages
+    runs-on: ubuntu-latest
+    steps:
+        - name: Setting vars for later access
+          id: set_vars
+          run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
+
+        - uses: actions/checkout@v3
+
+        - name: Set up QEMU
+          uses: docker/setup-qemu-action@v1
+
+        - name: Set up Docker Buildx
+          uses: docker/setup-buildx-action@v1
+
+        - name: Login to GitHub Container Registry
+          uses: docker/login-action@v1
+          with:
+              registry: ghcr.io
+              username: ${{ github.repository_owner }}
+              password: ${{ secrets.GITHUB_TOKEN }}
+
+        - name: Push to GitHub Packages
+          uses: docker/build-push-action@v3
+          with:
+              context: .
+              file: ./Dockerfile
+              push: true
+              tags: |
+                ${{ format('ghcr.io/b310-digital/teammapper:{0}', steps.set_vars.outputs.tag) }}
+                ghcr.io/b310-digital/teammapper:latest
+        - name: Image digest
+          run: echo ${{ steps.docker_build.outputs.digest }}