Update build.yml

.github/workflows/build.yml

@@ -46,14 +46,14 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Metadata
-        id: gen_tags
+        id: tags
         run: |
           if [[ $GITHUB_REF == 'refs/tags/'* ]]; then
             TAGS='["mochimqtt/server:latest","mochimqtt/server:'${GITHUB_REF/refs\/tags\//}'"]'
           else
             TAGS='["mochimqtt/server:latest"]'
           fi
-          echo '::set-output name=tags::'$TAGS
+          echo "name=tags" >> $TAGS
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
@@ -67,4 +67,4 @@ jobs:
           context: .
           file: ./Dockerfile
           push: true
-          tags: ${{ fromJson(steps.gen_tags.outputs.tags) }}
+          tags: ${{ steps.tags.outputs.tags }}