workflow: push docker image to ghcr.io

.github/workflows/docker.yml

@@ -8,6 +8,9 @@ on:
 jobs:
   build:
     runs-on: ubuntu-22.04
+    permissions:
+      packages: write
+      contents: read
     steps:
       - uses: actions/checkout@v4
       - name: Install packages
@@ -28,6 +31,11 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_HUB_USER }}
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Determine docker tags
         id: docker_tag
         run: |
@@ -42,18 +50,22 @@ jobs:
               echo "ALPINE_TAG=tsl0922/ttyd:alpine" >> $GITHUB_ENV
           esac
       - name: build/push docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile
           platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/s390x
           push: true
-          tags: ${{ env.DOCKER_TAG }}
+          tags: |
+            ${{ env.DOCKER_TAG }}
+            ghcr.io/${{ env.DOCKER_TAG }}
       - name: build/push docker image (alpine)
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile.alpine
           platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/s390x
           push: true
-          tags: ${{ env.ALPINE_TAG }}
+          tags: |
+            ${{ env.ALPINE_TAG }}
+            ghcr.io/${{ env.ALPINE_TAG }}