run tests also on PRs

Author: Gummibeer

.github/workflows/run-tests.yml

@@ -2,11 +2,13 @@ name: run-tests
 
 on:
   push:
+  pull_request:
   schedule:
     - cron: '0 0 * * *'
 
 jobs:
   test:
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
     runs-on: ${{ matrix.os }}
 
     strategy: