fix: update Jenkinsfile

ci/jenkins/Jenkinsfile

@@ -0,0 +1,19 @@
+def gitTag = null
+pipeline {
+    agent any
+
+    stages {
+         stage('Install') {
+            steps {
+                sh 'node -v'
+                sh 'pnpm install'
+            }
+         }
+
+         stage('Build & Deploy') {
+            steps {
+                sh 'pnpm run build:weapp -- --upload'
+            }
+         }
+    }
+}