fix: add setup pnpm to ci script

Author: samaratungajs

.github/workflows/build.yaml

@@ -50,6 +50,12 @@ jobs:
             echo "Unable to determine packager manager"
             exit 1
           fi
+      - name: Setup pnpm
+        if: steps.detect-package-manager.outputs.manager == 'pnpm'
+        uses: pnpm/action-setup@v2
+        with:
+          version: 9
+          run_install: false
       - name: Setup Node
         uses: actions/setup-node@v3
         with: