Forbid develop branch fork contributions

.github/workflows/pull_request.yml

@@ -1,7 +1,12 @@
 name: Pull Request
 on:
   pull_request:
-    types: [ opened, labeled, unlabeled ]
+    types: [ opened, edited, labeled, unlabeled, synchronize ]
+  workflow_call:
+    secrets:
+      ELEMENT_BOT_TOKEN:
+        required: true
+
 jobs:
   prevent-blocked:
     name: Prevent blocked
@@ -43,3 +48,30 @@ jobs:
               repo: context.repo.repo,
               labels: ['Z-Community-PR']
             });
+
+  close-if-fork-develop:
+    name: Forbid develop branch fork contributions
+    runs-on: ubuntu-latest
+    if: >
+      github.event.action == 'opened' &&
+      github.event.pull_request.head.ref == 'develop' &&
+      github.event.pull_request.head.repo.full_name != github.repository
+    steps:
+      - name: Close pull request
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: "Thanks for opening this pull request, unfortunately we do not accept contributions from the main" +
+                " branch of your fork, please re-open once you switch to an alternative branch for everyone's sanity.",
+            });
+            
+            github.rest.pulls.update({
+              pull_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'closed'
+            });