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.github/workflows/refresh-contributors-wall.yml

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+name: refresh-contributors-wall
+
+on:
+  # Daily refresh keeps the contributors wall CDN cache moving even when
+  # contributor data changes outside pull request merges.
+  schedule:
+    - cron: '0 1 * * *'
+  # Manual trigger: Use when you need to force-refresh the contributors wall
+  # outside the daily schedule (e.g., after a bulk contributor update or
+  # after fixing the cache_bust pattern in README files).
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: refresh-contributors-wall
+  cancel-in-progress: true
+
+jobs:
+  refresh:
+    name: Refresh contributors wall cache bust
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6.0.2
+
+      - name: Refresh cache bust date
+        run: |
+          DATE="$(date -u +%F)"
+          MATCHES="$(perl -0ne '$count += () = /cache_bust=\d{4}-\d{2}-\d{2}/g; END { print $count + 0 }' README*.md)"
+          if [ "$MATCHES" -eq 0 ]; then
+            echo "Warning: No cache_bust patterns found. README format may have changed."
+            exit 1
+          fi
+          perl -0pi -e "s/cache_bust=\d{4}-\d{2}-\d{2}/cache_bust=$DATE/g" README*.md
+
+      - name: Create refresh pull request
+        uses: peter-evans/create-pull-request@v8
+        with:
+          # Auth mirrors the metrics workflow: prefer a repository token that can
+          # create pull requests, with GITHUB_TOKEN as a fallback for repos where
+          # Actions-created PRs are allowed.
+          token: ${{ secrets.METRICS_TOKEN || secrets.GITHUB_TOKEN }}
+          add-paths: 'README*.md'
+          branch: automation/refresh-contributors-wall
+          delete-branch: true
+          commit-message: 'docs(readme): refresh contributors wall'
+          title: 'docs(readme): refresh contributors wall'
+          body: |
+            Refreshes the contributors wall cache bust date in README files.
+
+            Generated by the scheduled `refresh-contributors-wall` workflow.