add docker.io publish

.github/workflows/docker-publish.yml

@@ -14,6 +14,7 @@ on:
 
 env:
   REGISTRY: ghcr.io
+  DOCKER_REGISTRY: docker.io
   # github.repository as <account>/<repo>
   IMAGE_NAME: ${{ github.repository }}
 
@@ -40,6 +41,14 @@ jobs:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: Log in to docker hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: ${{ secrets.DOCKER_U }}
+          password: ${{ secrets.DOCKER_P }}
           
       - name: Extract metadata
         id: meta
@@ -55,7 +64,9 @@ jobs:
           context: .
           platforms: linux/amd64,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
+          tags: |
+            ${{ steps.meta.outputs.tags }}
+            ${{ env.DOCKER_REGISTRY }}/${{ secrets.DOCKER_U }}/jmusicbot:latest
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max