[workflow] fixed workflow check for docker build (#3849)

.github/workflows/release_docker_after_publish.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   release:
     name: Publish Docker Image to DockerHub
-    if: ( github.event_name == 'workflow_dispatch' || github.event.pull_request.merged == true ) && github.repository == 'hpcaitech/ColossalAI'
+    if: github.repository == 'hpcaitech/ColossalAI'
     runs-on: [self-hosted, gpu]
     container:
       image: "hpcaitech/docker-in-docker:latest"