install pnpm for GH actions

Author: jdugan1024

.github/workflows/deploy.yml

@@ -12,6 +12,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+      - uses: pnpm/action-setup@v2
+        name: Install pnpm
+        id: pnpm-install
+        with:
+          version: 8.3.1
+          run_install: false
       - name: Install Vercel CLI
         run: npm install --global vercel@latest
       - name: Pull Vercel Environment Information