ci(indexnow): bound the submission curl with a timeout and retries

Mirrors the sister repo's review: a slow or flaky api.indexnow.org must
not burn the job timeout, and three retries cover a transient error.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SrKzcwZBnref1sWYtdXynu

Author: MarkusNeusinger

.github/workflows/indexnow-submit.yml

@@ -92,7 +92,10 @@ jobs:
               --rawfile list "$f" \
               '{host: $host, key: $key, keyLocation: $loc,
                 urlList: ($list | split("\n") | map(select(length > 0)))}')
+            # Bounded: a slow or flaky api.indexnow.org must not burn the job
+            # timeout; three retries cover a transient error.
             code=$(curl -sS -o response.txt -w '%{http_code}' \
+              --max-time 30 --retry 3 --retry-delay 5 --retry-all-errors \
               -X POST "https://api.indexnow.org/indexnow" \
               -H "Content-Type: application/json; charset=utf-8" \
               --data "$body")