build: re-add auto-add for PRs with a different target (#60)

Author: DawoudSheraz

.github/workflows/auto-add-to-project.yml

@@ -1,9 +1,12 @@
-name: Auto Add Issues to Project
+name: Auto Add Issues and Pull Requests to Project
 
 on:
   issues:
     types:
       - opened
+  pull_request_target:
+    types:
+      - opened
 
 jobs:
   # https://github.com/actions/add-to-project