Push each image to an user github registry.

It can be used during development for testing.

.github/workflows/docker-alpine-image.yaml

@@ -14,12 +14,29 @@ jobs:
       -
         name: Checkout
         uses: actions/checkout@v3
+      -
+        name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Login to DockerHub Container Registry
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
       -
         name: Docker meta
         id: meta
         uses: docker/metadata-action@v4
         with:
-          images: pikvm/ustreamer
+          images: |
+            ${{ secrets.DOCKERHUB_USERNAME }}/ustreamer,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            ghcr.io/${{ github.repository }},enable=${{ github.event_name != 'pull_request' }}
           tags: |
             type=ref,event=tag
             type=sha,format=long
@@ -51,16 +68,9 @@ jobs:
           context: .
           platforms: linux/arm64,linux/amd64,linux/arm/v7
           file: pkg/docker/Dockerfile.alpine
-      -
-        name: Login to DockerHub
-        if: startsWith(github.ref, 'refs/tags/v')
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}          
       -
         name: Push
-        if: startsWith(github.ref, 'refs/tags/v')
+        if: steps.meta.outputs.tags != ''
         uses: docker/build-push-action@v3
         with:
           context: .