add drone

.drone.yml

@@ -2,12 +2,13 @@ kind: pipeline
 name: default
 
 steps:
-- name: build
+- name: npm install
   image: git.vaala.cloud/vaalacat/node:16-alpine
   commands:
    - |
       npm config set registry https://registry.npmmirror.com
       npm i -g pnpm
+      pnpm install
       pnpm build
       pnpm export