ci: add template verification workflow

  - Add GitHub Actions workflow for template validation
  - Configure Bazel caching for CI performance
  - Run build and test on PR/push to main

Author: kangeunchan

.github/workflows/template-check.yaml

@@ -0,0 +1,28 @@
+name: Template Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  verify-template:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bazel
+        uses: bazel-contrib/setup-bazel@0.16.0
+        with:
+          bazelisk-cache: true
+          disk-cache: ${{ github.workflow }}
+          repository-cache: true
+
+      - name: Verify Template Builds
+        run: bazel build //...
+
+      - name: Verify Template Tests
+        run: bazel test //...