ci: install latest pnpm

.github/workflows/deploy.yml

@@ -22,10 +22,8 @@ jobs:
         uses: actions/checkout@v3
       - name: Install, build, and upload your site
         uses: withastro/action@v1
-        # with:
-        # path: . # The root location of your Astro project inside the repository. (optional)
-        # node-version: 16 # The specific version of Node that should be used to build your site. Defaults to 16. (optional)
-        # package-manager: yarn # The Node package manager that should be used to install dependencies and build your site. Automatically detected based on your lockfile. (optional)
+        with:
+          package-manager: pnpm@latest
 
   deploy:
     needs: build