Add auto update stage to Jenkinsfile

Jenkinsfile

@@ -16,5 +16,14 @@ pipeline {
                 discordSend description: "Build: ${BUILD_NUMBER}", showChangeset: true, result: currentBuild.currentResult, title: currentBuild.fullProjectName, webhookURL: env.discordwebhook
             }
         }
+        stage('Copy to /mnt/updates/plugins') {
+            when {
+                branch 'main'
+                branch 'master'
+            }
+            steps {
+                sh 'cp build/libs/*.jar /mnt/updates/plugins/'
+            }
+        }
     }
 }