Adjustment to instructions

Jenkinsfile

@@ -76,11 +76,14 @@ pipeline {
                 script {
                     bat 'flutter pub get'
                     bat 'flutter build windows'
+                    bat 'mkdir out'
+                    bat 'dart compile exe -o out\\server.exe bin\\server.dart'
                 }
             }
 
             post {
                 always {
+                    archiveArtifacts artifacts: "out\\*.exe", fingerprint: true
                     deleteDir()
                 }
             }