ci: clear dir before build

Jenkinsfile

@@ -16,6 +16,15 @@ pipeline {
   }
 
   stages {
+    stage('Clean') {
+        dir ('build/vs2022/Release') {
+            deleteDir()
+        }
+        dir ('dist') {
+            deleteDir()
+        }
+    }
+
     stage('Build') {
       steps {
         bat '''
@@ -30,13 +39,13 @@ pipeline {
     stage('Archive') {
       steps {
         bat '''
-          7za a -tzip -mtm- build/kgg-dec.zip .\\build\\vs2022\\Release\\*
+          7za a -tzip -mtm- dist/kgg-dec.zip .\\build\\vs2022\\Release\\*
         '''
       }
 
       post {
         success {
-          archiveArtifacts 'build/*.zip'
+          archiveArtifacts 'dist/*.zip'
         }
       }
     }