fix release workflow to install pnpm

Author: WilsonLe

.github/workflows/release-package.yml

@@ -12,6 +12,7 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: 20
+      - run: npm install -g pnpm
       - run: pnpm test
 
   publish:
@@ -26,6 +27,7 @@ jobs:
         with:
           node-version: 20
           registry-url: https://npm.pkg.github.com/
+      - run: npm install -g pnpm
       - run: pnpm publish
         env:
           NODE_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}