Set minimum number of logs to keep in Jenkins (#5351)

Jenkinsfile

@@ -11,6 +11,9 @@ pipeline {
                 registryUrl 'https://950438895271.dkr.ecr.us-west-2.amazonaws.com'
                 args '--entrypoint= -v /astro_efs:/astro_efs'
                }
+        options {
+                buildDiscarder(logRotator(numToKeepStr: '5'))
+        }
     }
     environment {
         ISISDATA        =   '/astro_efs/isis_data'