Improve Qodana workflow: adjust checkout logic and enable PR-specific reporting

- Use separate checkout steps for pull_request events and other event types
- Enable Qodana PR-specific reporting conditionally for pull_request events

.github/workflows/qodana_code_quality.yml

@@ -17,14 +17,25 @@ jobs:
       pull-requests: write
       checks: write
     steps:
-      - uses: actions/checkout@v3
+      # Checkout for pull_request events: use the PR head SHA for accurate analysis
+      - name: Checkout (pull_request)
+        if: ${{ github.event_name == 'pull_request' }}
+        uses: actions/checkout@v4
         with:
-          ref: ${{ github.event.pull_request.head.sha }}  # to check out the actual pull request commit, not the merge commit
+          ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0  # a full history is required for pull request analysis
+
+      # Checkout for push and other events (e.g., merges to develop): use the current commit
+      - name: Checkout (push/other)
+        if: ${{ github.event_name != 'pull_request' }}
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - name: 'Qodana Scan'
         uses: JetBrains/qodana-action@v2025.2
         with:
-          pr-mode: false
+          # Enable PR-specific reporting only for pull_request events
+          pr-mode: ${{ github.event_name == 'pull_request' }}
         env:
           QODANA_TOKEN: ${{ secrets.QODANA_TOKEN_268690425 }}
           QODANA_ENDPOINT: 'https://qodana.cloud'