Removed global install of pnpm

.gitea/workflows/build.yaml

@@ -13,14 +13,12 @@ jobs:
     runs-on: host
 
     steps:
-      - name: Setup pnpm
-        run: npm install -g pnpm
       - name: Check out repository code
         uses: actions/checkout@v4
       - name: Install dependencies
-        run: pnpm install
+        run: echo y | npm exec -- pnpm install
       - name: Build
-        run: pnpm build
+        run: npm exec -- pnpm build
       - name: Upload artifacts
         uses: actions/upload-artifact@v3 # Deprecated but v4+ is not supported for GHES
         with: