setup-pnpm action is bad, do it ourself

.github/workflows/build.yml

@@ -59,11 +59,10 @@ jobs:
         [ -f requirements.txt ] && pip install -r requirements.txt
 
     - name: Install JS dependencies ⬇️
-      uses: pnpm/action-setup@v2.2.3
-      with:
-        run_install: |
-          - cwd: ./frontend
-            args: [--frozen-lockfile]
+      working-directory: ./frontend
+      run:
+        npm i -g pnpm
+        pnpm ci --frozen-lockfile
 
     - name: Build JS Frontend 🛠️
       working-directory: ./frontend