[CI] Debug part A of many for #177

Changes in file .github/workflows/CI-MATs.yml:
 - kept permissions: {} by default
 - added job permissions to checks in CI-MATs

Author: reactive-firewall

.github/workflows/CI-MATs.yml

@@ -22,6 +22,7 @@ jobs:
     permissions:
       actions: read
       pull-requests: read
+      checks: write
     runs-on: ubuntu-latest
     outputs:
       should_run: ${{ steps.check.outputs.should_run }}