add agent_root_folder definition

Jenkinsfile

@@ -1,8 +1,16 @@
 #!groovy
 
+/**
+ * Deploy components to the D4Science Infrastructure (dev-only)
+ *
+ * Manuele Simi (ISTI-CNR)
+ */
 
 // related jenkins job: https://jenkins.d4science.org/job/gCubeDeployer/
 
+def agent_root_folder = '/var/lib/jenkins/.m2'
+
+
 pipeline {
     agent {
         label 'CD'
@@ -16,7 +24,7 @@ pipeline {
 
     environment {
         AGENT_ROOT_FOLDER = "${agent_root_folder}"
-        DEPLOY_FILE = "${agent_deploy_file}/deploy.txt"
+        DEPLOY_FILE = "${agent_root_folder}/deploy.txt"
     }
     stages {
         stage('initialize environment') {