Create lock workflow (#49)

Author: jesserockz

.github/workflows/lock.yml

@@ -0,0 +1,67 @@
+---
+name: Lock closed issues and PRs
+
+on:
+  schedule:
+    - cron: "45 0 * * *" # Run daily at 00:45 UTC
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+
+concurrency:
+  group: lock-closed
+  cancel-in-progress: false
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Lock closed issues and PRs
+        uses: actions/github-script@v7.0.1
+        with:
+          script: |
+            const PR_CLOSE_DAYS = 1;
+            const ISSUE_CLOSE_DAYS = 7;
+            const EXCLUDE_LABEL = 'keep-open';
+            const LOCK_REASON = 'resolved';
+
+            const now = new Date();
+            const prCutoffDate = new Date(now.getTime() - PR_CLOSE_DAYS * 24 * 60 * 60 * 1000);
+            const issueCutoffDate = new Date(now.getTime() - ISSUE_CLOSE_DAYS * 24 * 60 * 60 * 1000);
+
+            console.log(`Will lock PRs closed before: ${prCutoffDate.toISOString()}`);
+            console.log(`Will lock issues closed before: ${issueCutoffDate.toISOString()}`);
+
+            // The `listForRepo` endpoint fetches both issues and pull requests.
+            // We fetch all closed items and filter them in the script.
+            const closedItems = await github.paginate(github.rest.issues.listForRepo, {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'closed',
+            });
+
+            for (const item of closedItems) {
+              if (item.locked) continue;
+
+              const hasExcludeLabel = item.labels.some(label => label.name === EXCLUDE_LABEL);
+              if (hasExcludeLabel) continue;
+
+              const closedAt = new Date(item.closed_at);
+              const isPr = 'pull_request' in item;
+
+              if ((isPr && closedAt < prCutoffDate) || (!isPr && closedAt < issueCutoffDate)) {
+                console.log(`Locking ${isPr ? 'PR' : 'issue'} #${item.number} which was closed at ${item.closed_at}`);
+                try {
+                  await github.rest.issues.lock({
+                    owner: context.repo.owner,
+                    repo: context.repo.repo,
+                    issue_number: item.number,
+                  });
+                  console.log(`Successfully locked #${item.number}.`);
+                } catch (e) {
+                  console.error(`Failed to lock #${item.number}: ${e.message}`);
+                }
+              }
+            }