add multiplatform push

Author: corbanvilla

.github/workflows/docker.yml

@@ -62,3 +62,30 @@ jobs:
           echo VERSION=$VERSION
           docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
           docker push $IMAGE_ID:$VERSION
+
+  push-multiplatform:
+    name: Push multi platform
+    needs: build-linux
+    runs-on: ubuntu-latest
+    if: ${{ github.event_name != 'pull_request' }}
+    steps:
+      - name: Log in to registry
+        if: ${{ github.event_name != 'pull_request' }}
+        # This is where you will update the PAT to GITHUB_TOKEN
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin
+        
+      - name: Get images
+        shell: bash
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "main" ] && VERSION=latest
+          docker manifest create $IMAGE_ID:$VERSION $IMAGE_ID:$VERSION-arm64 $IMAGE_ID:$VERSION-x86_64
+          docker manifest push $IMAGE_ID:$VERSION