Removed stages - not supported

Jenkinsfile

@@ -27,7 +27,6 @@ spec:
     environment {
       MEDUSA_VER = '0.4.2'
     }
-    stages {
     stage('Build with Kaniko') {
       git url: 'ssh://git@git.ervine.org/jonny/x86_64-alpine-medusa.git', credentialsId: 'jenkins-to-git'
       container('kaniko') {
@@ -38,5 +37,4 @@ spec:
       hangoutsNotify message: "Medusa ${MEDUSA_VER} on openSUSE Leap 15.2 has built",token: "A2ET831pVslqXTqAx6ycu573r",threadByJob: false
     }
   }
-  }
 }