Publish image to GitHub Container Registry (#28)

Author: fwilhe

.github/workflows/push.yml

@@ -16,5 +16,8 @@ jobs:
     - name: Run CI
       run: |
         echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USER }} --password-stdin
+        echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u ${{ secrets.CR_USER }} --password-stdin
         docker build -t ppiper/cf-cli:latest .
+        docker tag ppiper/cf-cli:latest ghcr.io/sap/ppiper-cf-cli:latest
         docker push ppiper/cf-cli:latest
+        docker push ghcr.io/sap/ppiper-cf-cli:latest

.github/workflows/release.yml

@@ -26,8 +26,11 @@ jobs:
       - name: Build, test and push
         run: |
           echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USER }} --password-stdin
+          echo "${{ secrets.CR_PAT }}" | docker login https://ghcr.io -u ${{ secrets.CR_USER }} --password-stdin
           docker build -t ppiper/cf-cli:${{ env.PIPER_version }} .
+          docker tag ppiper/cf-cli:${{ env.PIPER_version }} ghcr.io/sap/ppiper-cf-cli:${{ env.PIPER_version }}
           docker push ppiper/cf-cli:${{ env.PIPER_version }}
+          docker push ghcr.io/sap/ppiper-cf-cli:${{ env.PIPER_version }}
       - uses: SAP/project-piper-action@master
         with:
           piper-version: latest