Update publish.yml

Author: marcusolsson

.github/workflows/publish.yml

@@ -26,6 +26,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
       - uses: actions/setup-node@v4
         with:
           node-version: 20