fix: Dashboard main should also setup protoc (risingwavelabs#8717)

Author: liurenjie1024

.github/workflows/dashboard_main.yml

@@ -1,8 +1,8 @@
 name: Dashboard (main)
 on:
   push:
-    branches: [main]
-    paths: [dashboard/**]
+    branches: [ main ]
+    paths: [ dashboard/** ]
 jobs:
   dashboard-ui-deploy:
     runs-on: ubuntu-latest
@@ -11,6 +11,10 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: '18'
+      - uses: arduino/setup-protoc@v1
+        with:
+          version: "3.x"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: build
         working-directory: ./dashboard
         run: |