Use variable for pool

Author: cheenamalhotra

.github/workflows/auto-assign-pr.yml

@@ -25,8 +25,19 @@ jobs:
     steps:
       - name: Calculate Workload and Apply
         uses: actions/github-script@v7
+        env:
+          PR_REVIEWER_POOL: ${{ vars.PR_REVIEWER_POOL }}
         with:
           script: |
+            // Read the candidate pool from the repository variable PR_REVIEWER_POOL
+            // (Settings > Secrets and variables > Actions > Variables).
+            // Value is a comma-separated list of GitHub logins who are qualified to be assigned PRs to review.
+            const rawPool = process.env.PR_REVIEWER_POOL ?? '';
+            const pool = rawPool.split(',').map(s => s.trim()).filter(Boolean);
+            if (pool.length === 0) {
+              core.warning('PR_REVIEWER_POOL variable is empty or not set. Skipping auto-assignment.');
+              return;
+            }
             const owner = context.repo.owner;
             const repo = context.repo.repo;
             const prNumber = context.issue.number;