fix: avoid root spacetime health checks

jenkins/Jenkinsfile.production-server-provision

@@ -253,14 +253,12 @@ pipeline {
 
             is_spacetimedb_ready() {
               local server_url="http://127.0.0.1:3101"
-              local output=""
 
               if command -v curl >/dev/null 2>&1 && curl -fsS "${server_url}/v1/ping" >/dev/null 2>&1; then
                 return 0
               fi
 
-              output="$("${SPACETIME_ROOT}/spacetime" --root-dir="${SPACETIME_ROOT}" server ping "${server_url}" 2>&1 || true)"
-              [[ "${output}" == *"Server is online:"* ]]
+              return 1
             }
 
             wait_for_spacetimedb_service() {