cd(push-to-discord.yaml): update event trigger to pull_request_target…

… when merged on main branch

.github/workflows/push-to-discord.yaml

@@ -1,14 +1,15 @@
 name: Push To Discord Channel on Pull Request Closed
 
 on:
-  workflow_dispatch:
-  pull_request:
-    types: [synchronize]
+  pull_request_target:
+    types:
+      - closed
     branches:
       - main
 
 jobs:
   push-to-discord:
+    if: github.event.pull_request.merged == true
     runs-on: ubuntu-latest
 
     steps:
@@ -19,6 +20,5 @@ jobs:
         uses: fjogeleit/[email protected]
         with:
           url: $ {{ secrets.GDSC_CAU_DISCORD_ARTICLES }}
-          method: 'POST'
+          method: "POST"
           data: '{ "embeds": [{ "author": { "name": "${{ github.event.pull_request.user.name }}" }, "title": "${{ github.event.pull_request.title }}", "description": "${{ github.event.pull_request.body }}", "color": "6393081" }] }'
-