build(ui): add Node setup and pnpm installation for UI build process

.gitea/workflows/release.yml

@@ -40,6 +40,20 @@ jobs:
       - name: Download dependencies
         run: go mod download
 
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+
+      - name: Install pnpm
+        run: npm install -g pnpm
+
+      - name: Build UI
+        run: |
+          cd ui
+          pnpm install --frozen-lockfile
+          pnpm run build
+
       - name: Set build vars
         id: vars
         run: |