Investigate missing test-result reports

Test results are not published properly due to an "There is no pull
request for commit <...>" error, indicating a problem with visibility
and or accessability...

Author: ptziegler

.github/workflows/unit-tests.yml

@@ -15,6 +15,9 @@ jobs:
     permissions:
       checks: write
       pull-requests: write
+      contents: read
+      issues: read
+      actions: read
 
     steps:
       - name: Download and Extract Artifacts