ci(fix): Re-tag images for the GitHub Container Registry

Images pushed to ghcr.io require a separate tag including the registry URL.

.github/workflows/docker-image.yml

@@ -8,6 +8,7 @@ env:
   DOCKER_REGISTRY: ${{secrets.DOCKER_REGISTRY}}
   DOCKER_USERNAME: ${{secrets.DOCKER_USERNAME}}
   DOCKER_ACCESS_TOKEN: ${{secrets.DOCKER_ACCESS_TOKEN}}
+  GITHUB_CONTAINER_REGISTRY: ghcr.io
 
 jobs:
 
@@ -23,6 +24,12 @@ jobs:
       run: echo -n $DOCKER_ACCESS_TOKEN | docker login $DOCKER_REGISTRY -u $DOCKER_USERNAME --password-stdin 
     - name: Push Image to DockerHub
       run: docker push thehale/python-poetry:latest
+    - name: Tag the image for the GitHub Container Registry
+      run: docker tag thehale/python-poetry:latest ghcr.io/thehale/python-poetry:latest
+    - name: Login to GitHub Container Registry
+      run: echo -n ${{ secrets.GITHUB_TOKEN }} | docker login $GITHUB_CONTAINER_REGISTRY -u ${{ github.actor }} --password-stdin 
+    - name: Push Image to GitHub Container Registry
+      run: docker push ghcr.io/thehale/python-poetry:latest
 
 
   build-versions:
@@ -45,3 +52,9 @@ jobs:
       run: echo -n $DOCKER_ACCESS_TOKEN | docker login $DOCKER_REGISTRY -u $DOCKER_USERNAME --password-stdin 
     - name: Push Image to DockerHub
       run: docker push thehale/python-poetry:${{ matrix.poetry_version }}-py${{ matrix.python_image_tag }}
+    - name: Login to GitHub Container Registry
+      run: echo -n ${{ secrets.GITHUB_TOKEN }} | docker login $GITHUB_CONTAINER_REGISTRY -u ${{ github.actor }} --password-stdin
+    - name: Tag the image for the GitHub Container Registry
+      run: docker tag thehale/python-poetry:${{ matrix.poetry_version }}-py${{ matrix.python_image_tag }} ghcr.io/thehale/python-poetry:${{ matrix.poetry_version }}-py${{ matrix.python_image_tag }}
+    - name: Push Image to GitHub Container Registry
+      run: docker push ghcr.io/thehale/python-poetry:${{ matrix.poetry_version }}-py${{ matrix.python_image_tag }}