add standalone to dockerhub (#4801)

Co-authored-by: Michele Sciabarra <30654959+sciabarracom@users.noreply.github.com>
diff --git a/tools/jenkins/apache/dockerhub.groovy b/tools/jenkins/apache/dockerhub.groovy
index 3206e37..e9eebd6 100644
--- a/tools/jenkins/apache/dockerhub.groovy
+++ b/tools/jenkins/apache/dockerhub.groovy
@@ -29,7 +29,7 @@
       withCredentials([usernamePassword(credentialsId: 'openwhisk_dockerhub', passwordVariable: 'DOCKER_PASSWORD', usernameVariable: 'DOCKER_USER')]) {
           sh 'docker login -u ${DOCKER_USER} -p ${DOCKER_PASSWORD}'
       }
-      def PUSH_CMD = "./gradlew :core:controller:distDocker :core:invoker:distDocker :core:monitoring:user-events:distDocker :tools:ow-utils:distDocker :core:cosmos:cache-invalidator:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk"
+      def PUSH_CMD = "./gradlew :core:controller:distDocker :core:invoker:distDocker :core:standalone:distDocker :core:monitoring:user-events:distDocker :tools:ow-utils:distDocker :core:cosmos:cache-invalidator:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk"
       def gitCommit = sh(returnStdout: true, script: 'git rev-parse HEAD').trim()
       def shortCommit = gitCommit.take(7)
       sh "./gradlew clean"