[skip e2e]Only allow one nightly at the same time (#19800)

Signed-off-by: NJenny Li <jing.li@zilliz.com>
Signed-off-by: NJenny Li <jing.li@zilliz.com>

ci/jenkins/Nightly.groovy

@@ -20,6 +20,7 @@ pipeline {
         buildDiscarder logRotator(artifactDaysToKeepStr: '30')
     // parallelsAlwaysFailFast()
         preserveStashes(buildCount: 5)
+        disableConcurrentBuilds()
     }
     agent {
         kubernetes {