update docker actions

.github/workflows/docker.yml

@@ -2,8 +2,13 @@ name: Publish Docker image
 on:
   workflow_dispatch:
   push:
+    branches:
+      - master
     tags:
       - 'v*'
+  pull_request:
+    branches:
+      - 'master'
 jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub
@@ -13,13 +18,10 @@ jobs:
         uses: actions/checkout@v2
       -
         name: Docker meta
-        id: docker_meta
-        uses: crazy-max/ghaction-docker-meta@v1
+        id: meta
+        uses: docker/metadata-action@v4
         with:
           images: crackair/xrayr
-          tag-semver: |
-            {{version}}
-            {{major}}.{{minor}}
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
@@ -36,5 +38,5 @@ jobs:
           context: .
           platforms: linux/arm/v7,linux/arm64,linux/amd64,linux/s390x
           push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.docker_meta.outputs.tags }}
-          labels: ${{ steps.docker_meta.outputs.labels }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}