.github: Add information about quarantine process to PR

Codeowners should be informed if their test configuration
is added to quarantine.
First step is information about quarantine process for
author of pull request.

Signed-off-by: Katarzyna Giądła <[email protected]>

Author: katgiadla

.github/workflows/review-quarantine-pr.yml

@@ -0,0 +1,29 @@
+name: Quarantine validation
+
+on:
+  pull_request_target:
+    branches:
+      - main
+      - v*-branch
+    paths:
+      - '**/scripts/quarantine*.yaml'
+jobs:
+  quarantine-info:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Add information about quarantine process
+        run: |
+          # Find existing comment
+          comment_id=$(gh pr view ${{ github.event.pull_request.number }} --json comments --jq '.comments[] | select(.body | contains("Quarantine Process")) | .id' || echo "")
+          if [[ -z "$comment_id" ]]; then
+            # No comment - create new one
+            gh pr comment "$PR_NUMBER" --body "$BODY"
+          fi
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          BODY: >
+            Since quarantine was modified, please make sure
+            you are following the process described in
+            [Quarantine Process](https://nordicsemi.atlassian.net/wiki/spaces/NCS/pages/1104576817/Quarantine).