trigger test workflow on forked pull request

Author: jdkent

.github/workflows/testing.yml

@@ -4,13 +4,18 @@ on:
   push:
     branches:
       - "master"
-  pull_request:
+  pull_request_target:
     branches:
       - "*"
   schedule:
     # Run tests every Sunday at 12am
     - cron: "0 0 * * 0"
 
+permissions:
+  contents: read
+  checks: write
+  pull-requests: write
+
 concurrency:
   group: environment-${{ github.ref }}
   cancel-in-progress: true