[infra] check out code also for merge queues (#3377)

Co-authored-by: Martin Costello <[email protected]>

Author: Kielek

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - name: check out code
       uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
-      if: ${{ github.event_name == 'push' }}
+      if: github.event_name == 'push' || github.event_name == 'merge_group'
 
     - uses: AurorNZ/paths-filter@3b1f3abc3371cca888d8eb03dfa70bc8a9867629 # v4.0.0
       id: changes