Gitea mailer sendmail template and php-fpm cluster tuning.

Co-authored-by: Cursor <cursoragent@cursor.com>

sim/cluster0/lab-seeds/backend/scripts/gitea/gitea_protect_branches.sh

@@ -73,7 +73,9 @@ gitea_protect_payload() {
   "push_whitelist_teams": ["$GITEA_PROTECT_PUSH_TEAM"],
   "enable_force_push": false,
   "enable_force_push_allowlist": false,
-  "block_admin_merge_override": true
+  "block_admin_merge_override": true,
+  "enable_status_check": true,
+  "status_check_contexts": ["androidcast/build"]
 }
 EOF
 }