Daily review reminder workflow

.github/workflows/daily-reminder.yml

@@ -0,0 +1,28 @@
+name: Daily review reminder
+
+on:
+  schedule:
+    # 16:00 UTC = 17:00 Europe/Warsaw in winter (18:00 in summer)
+    - cron: '0 16 * * *'
+  workflow_dispatch:
+
+permissions:
+  pull-requests: write
+
+jobs:
+  remind:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mention the owner on open daily PRs
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+        run: |
+          prs=$(gh pr list --label daily --state open --json number --jq '.[].number')
+          if [ -z "$prs" ]; then
+            echo "No open daily PRs - nothing to remind about."
+            exit 0
+          fi
+          for pr in $prs; do
+            gh pr comment "$pr" --body "@${{ github.repository_owner }} ⏰ This daily topic is still waiting for your review."
+          done