add missing step

Author: idleberg

.github/workflows/default.yml

@@ -21,6 +21,14 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+      - uses: pnpm/action-setup@v2.0.1
+        name: Install pnpm
+        id: pnpm-install
+        with:
+          version: 7
+          run_install: false
+
+
       - name: Get pnpm store directory
         id: pnpm-cache
         run: |