Merge pull request #59 from jumpserver/pr@master@fix_pnpm

fixed: Fixed add pnpm

Author: ZhaoJiSen

appveyor.yml

@@ -21,6 +21,7 @@ init:
 
 install:
   - ps: Install-Product node 20 x64
+  - npm install pnpm -g
   - git reset --hard HEAD
   - pnpm config set ignore-engines true
   - pnpm