fix: add a delay before the contributors workflow sets auto-merge

.github/workflows/contributors.yml

@@ -81,6 +81,36 @@ jobs:
         name: Auto-approve PR
         run: gh pr review --approve "$PR_URL"
       -
-        # TODO: should wait for all workflows to complete before merging
+        name: Wait for all workflow runs to complete
+        run: |
+          PR_NUMBER=$(echo "$PR_URL" | grep -oP '\d+$')
+          echo "Waiting for all checks to complete on PR #${PR_NUMBER}..."
+
+          MAX_WAIT=600  # 10 minutes max wait
+          ELAPSED=0
+          SLEEP_INTERVAL=10
+
+          while [ $ELAPSED -lt $MAX_WAIT ]; do
+            # Get all workflow runs for this PR's head SHA
+            PR_DATA=$(gh pr view "$PR_NUMBER" --json headRefOid,statusCheckRollup)
+            HEAD_SHA=$(echo "$PR_DATA" | jq -r '.headRefOid')
+
+            # Check if any workflows are still in progress
+            IN_PROGRESS=$(echo "$PR_DATA" | jq -r '.statusCheckRollup[] | select(.status == "IN_PROGRESS" or .status == "QUEUED" or .status == "PENDING") | .name' | wc -l)
+
+            if [ "$IN_PROGRESS" -eq 0 ]; then
+              echo "::notice::All workflow runs completed for SHA ${HEAD_SHA}"
+              break
+            fi
+
+            echo "Still waiting for $IN_PROGRESS check(s) to complete..."
+            sleep $SLEEP_INTERVAL
+            ELAPSED=$((ELAPSED + SLEEP_INTERVAL))
+          done
+
+          if [ $ELAPSED -ge $MAX_WAIT ]; then
+            echo "::warning::Timeout waiting for all checks to complete, proceeding anyway"
+          fi
+      -
         name: Auto-merge PR
         run: gh pr merge --auto --rebase "$PR_URL"