Run publish action when a merge is performed on the main branch (#50)

Author: jamsesso

.github/workflows/publish.yml

@@ -2,12 +2,16 @@ name: Publish
 
 on:
   push:
-    branches: [ main, master ]
+    branches: [ main ]
+  pull_request:
+    types: [ closed ]
+    branches: [ main ]
 
 jobs:
   publish:
     runs-on: ubuntu-latest
     environment: production
+    if: github.event.pull_request.merged == true || github.event_name == 'push'
     steps:
     - uses: actions/checkout@v4
     - name: Set up JDK 8