Adding Clean Directory and Checkout stage

Author: michelsciortino

CI/JenkinsfileTestCleanInstance

@@ -31,7 +31,6 @@ def slackNotification(buildStatus,String notification_url = "",project_name = ""
             ]
         ]
     )
-
     sh "curl -X POST --fail -H 'Content-type: application/json' --data '${payload}' ${notification_url}"
 }
 
@@ -89,6 +88,14 @@ pipeline {
                 }
             }
         }
+        stage ('Clean Directory and Checkout') {
+            steps {
+                dir('.') {
+                    deleteDir()
+                }
+                checkout scm
+            }
+        }
         stage('Build Base Image') {
             when {
                 triggeredBy 'TimerTrigger'