modify release.yml to push image to ghcr

.github/workflows/release-rc.yml

@@ -52,7 +52,7 @@ jobs:
         username: wsmoogle
         password: ${{ secrets.DOCKER_REGISTRY_ON_GITHUB_PASSWORD }}
 
-    - name: Build and push
+    - name: Build and push to ghcr
       uses: docker/build-push-action@v2
       with:
         context: .

.github/workflows/release.yml

@@ -97,13 +97,6 @@ jobs:
         additional-tags: 'latest'
         publish: true
 
-    - name: Slack Notification
-      uses: weseek/ghaction-release-slack-notification@master
-      with:
-        channel: '#general'
-        url: ${{ secrets.SLACK_WEBHOOK_URL }}
-        created_tag: 'v${{ needs.github-release.outputs.RELEASE_VERSION }}${{ env.SUFFIX }}'
-
     - name: Update Docker Hub Description
       uses: peter-evans/dockerhub-description@v2
       with:
@@ -112,6 +105,28 @@ jobs:
         repository: weseek/growi
         readme-filepath: ./docker/README.md
 
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v1
+      with:
+        registry: ghcr.io
+        username: wsmoogle
+        password: ${{ secrets.DOCKER_REGISTRY_ON_GITHUB_PASSWORD }}
+
+    - name: Build and push to ghcr
+      uses: docker/build-push-action@v2
+      with:
+        context: .
+        file: ./docker/Dockerfile
+        push: true
+        tags: ghcr.io/weseek/growi:${{ needs.github-release.outputs.RELEASE_VERSION }}${{ env.SUFFIX }}
+
+    - name: Slack Notification
+      uses: weseek/ghaction-release-slack-notification@master
+      with:
+        channel: '#general'
+        url: ${{ secrets.SLACK_WEBHOOK_URL }}
+        created_tag: 'v${{ needs.github-release.outputs.RELEASE_VERSION }}${{ env.SUFFIX }}'
+
     - name: Check whether workspace is clean
       run: |
         STATUS=`git status --porcelain`