remove pull request from docker workflow trigger

Author: beer-1

.github/workflows/docker.yml

@@ -11,13 +11,6 @@ on:
       - "**.go"
       - "go.mod"
       - "go.sum"
-  pull_request:
-    branches:
-      - "main"
-    paths:
-      - "**.go"
-      - "go.mod"
-      - "go.sum"
 
 env:
   REGISTRY: ghcr.io