add pnpm/action-setup to gh actions

Author: notunderctrl

.github/workflows/lint.yaml

@@ -10,6 +10,10 @@ jobs:
         name: 🔍 Lint
         runs-on: ubuntu-latest
         steps:
+            - uses: pnpm/action-setup@v2
+                with:
+                   version: 8
+
             - name: 📚 Checkout
               uses: actions/checkout@v3