Merge pull request #34 from Acris/dependabot/github_actions/docker/metadata-action-4

Bump docker/metadata-action from 3 to 4

Author: Acris

.github/workflows/docker-publish.yml

@@ -14,7 +14,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v4
         with:
           images: acrisliu/shadowsocks-libev
           tags: |