add clean workspace to jenkins templates

snippets/jenkins/template/general/Jenkinsfile

@@ -35,5 +35,8 @@ pipeline {
                 }
             }
         }
+        cleanup {
+            cleanWs()
+        }
     }
 }

snippets/jenkins/template/node/Jenkinsfile

@@ -20,4 +20,10 @@ pipeline {
             }
         }
     }
+
+    post {
+        cleanup {
+            cleanWs()
+        }
+    }
 }