ci: add pnpm install step in release workflow

Author: sapphi-red

.github/workflows/release.yml

@@ -24,5 +24,7 @@ jobs:
           node-version-file: ".node-version"
           cache: "pnpm"
 
+      - run: pnpm install
+
       - name: release
         run: npm i -g npm@^11.5.2 && pnpm publish --provenance --no-git-checks