Fix jenkinsfile syntax

Jenkinsfile

@@ -1,9 +1,11 @@
 pipeline {
     agent any
     options {
-        buildDiscarder {
+        buildDiscarder (
+            logRotator(
                 numToKeepStr: '5'        
-        }
+            )
+        )
     }
     
     stages {
@@ -12,15 +14,20 @@ pipeline {
                 label 'linux'
             }
             steps {
+                script {
                     sh '''
                     dotnet restore
                     dotnet publish LibAC.csproj --nologo -c Release --self-contained true /p:PublishSingleFile=true /p:PublishTrimmed=true
                     '''
                 }
                     
+            }
+            
             post {
+                always {
                     archiveArtifacts artifacts: "build/Release/net8.0/LibAC.dll"
                 }
             }
         }
     }
+}