Update greetings.yml

.github/workflows/greetings.yml

@@ -2,17 +2,21 @@ name: Greetings
 
 on:
   issues:
-    types:
-      - opened
+    types: [opened]
+  pull_request:
+    types: [opened]
 
 permissions:
   issues: write
+  pull-requests: write
 
 jobs:
   greeting:
+    name: Greet first-time contributors
     runs-on: ubuntu-latest
     steps:
       - uses: actions/first-interaction@v3
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          issue_message: "Dependabot's first issue"
+          issue_message: "Dependabot's first issue"
+          pr_message: "Thank you for your pull request!"