Add docker-publish workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,22 @@
+name: Docker Push
+on:
+  release:
+    types: published
+jobs:
+  Build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: crazy-max/ghaction-docker-buildx@v3
+        with:
+          buildx-version: latest
+          qemu-version: latest
+      - name: Docker build
+        run: |
+          echo "${{ secrets.DOCKER }}" | docker login --username carlgo11 --password-stdin
+          docker buildx create --use
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          echo VERSION=$VERSION
+          docker buildx build --platform linux/amd64,linux/arm/v7,linux/arm64 --rm --tag carlgo11/guest-portal:latest --tag carlgo11/tempfiles-backend:$VERSION --push --compress .