try new GH Action for GHCR Docker

.github/workflows/docker-image.yml

@@ -0,0 +1,38 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "master" ]
+  workflow_dispatch: # run manually
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+    - uses: actions/checkout@v3
+    - # Activate cache export feature to reduce build time of images
+      name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+    - name: Build the Docker image
+      run: make docker DOCKER_TAG=ghcr.io/ocrd/core
+    - name: Build the Docker image with GPU support
+      run: make docker-cuda DOCKER_TAG=ghcr.io/ocrd/core-cuda
+    #- name: Authenticate with ghcr.io
+    #  run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Push images to Github Container Registry
+      run: |
+        docker push ghcr.io/ocrd/core:latest
+        docker push ghcr.io/ocrd/core-cuda:latest
+