Merge pull request #30381 from woocommerce/fix/automatic-milestoning-for-fork-prs

Fix: automatic milestoning GitHub action not working with PRs coming from forks

.github/workflows/pull-request-post-merge-processing.yml

@@ -1,6 +1,6 @@
 name: "Pull request post-merge processing"
-on: 
-  pull_request:
+on:
+  pull_request_target:
     types: [closed]
 
 jobs:

.github/workflows/scripts/assign-milestone-to-merged-pr.php

@@ -85,6 +85,7 @@ foreach ( $milestones as $milestone ) {
 
 // If all the milestones have a release branch, just take the newest one.
 if ( is_null( $chosen_milestone ) ) {
+	echo "WARNING: No milestone without release branch found, the newest one will be assigned.\n";
 	$chosen_milestone = $milestones[0];
 }