Also clean the built in node

Jenkinsfile

@@ -1,7 +1,5 @@
 pipeline {
-    agent {
+    agent none
-        label 'agent2'
-    }
 
     triggers {
         cron("59 23 * * 1") // Clean up every monday
@@ -12,7 +10,19 @@ pipeline {
     }
 
     stages {
-        stage('Clean docker images') {
+        stage('Clean docker on agent2') {
+            agent {
+                label 'agent2'
+            }
+            steps {
+                sh 'docker system prune -a -f'
+                sh 'docker network prune -f'
+            }
+        }
+        stage('Clean docker on built-in-node') {
+            agent {
+                label 'built_in_node'
+            }
             steps {
                 sh 'docker system prune -a -f'
                 sh 'docker network prune -f'