revert pr trigger for github image action

Signed-off-by: 2byrds <2byrds@gmail.com>

.github/workflows/publish-api.yml

@@ -6,11 +6,13 @@ on:
     branches:
       - "main"
   pull_request:
-    types: [closed]
+    branches:
+      - "main"
   workflow_dispatch:
     inputs:
       version:
-        required: true
+        required: false
+        default: 'dev'
 jobs:
   push_to_registry:
     name: Push Docker image to Docker Hub