chore: setup ghcr publishing

.github/workflows/dockerimage.yml

@@ -0,0 +1,48 @@
+name: Docker Image CI
+
+on:
+  push:
+    tags:
+      - v*
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: Build and push image to registry
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --tag $IMAGE_NAME --label "runnumber=${GITHUB_RUN_ID}"
+
+      - name: Log in to registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login $REGISTRY -u ${{ github.actor }} --password-stdin
+
+      - name: Push image
+        run: |
+          IMAGE_ID="${REGISTRY}/${IMAGE_NAME}"
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          VERSION_START=${VERSION%%.*}
+
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+
+          # Push latest
+          docker tag $IMAGE_NAME $IMAGE_ID:latest
+          docker push $IMAGE_ID:latest
+          # Push full version
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION
+          # Push short version
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION_START
+          docker push $IMAGE_ID:$VERSION_START