Revert "refactor: use yarn instead of pnpm (#23)"

This reverts commit e5ee5ab7a5.

.drone.yml

@@ -8,8 +8,9 @@ steps:
     image: node:18.16.0-bullseye
     commands:
       #   - git config --global --add safe.directory "/drone/src"
-      - yarn install
-      - yarn run build
+      - npm install -g pnpm
+      - pnpm i --frozen-lockfile
+      - pnpm build
 
   - name: publish
     image: node:18.16.0-bullseye