Add full clean on Jenkinsfile

Jenkinsfile

@@ -16,10 +16,10 @@ node {
          * Second, the 'latest' tag.
          * Pushing multiple tags is cheap, as all the layers are reused. */
         app.push()
-        app.push("${env.BUILD_NUMBER}")  
+        app.push("${env.BUILD_NUMBER}")
         
     }
     stage('Cleaning'){
-        sh "docker image prune -f"
+        sh "docker image prune -f -a"
     }
 }