add cargo fmt to CI

Author: rickrain

.github/workflows/ci.yml

@@ -18,7 +18,9 @@ jobs:
     - uses: actions/checkout@v4
     - name: Build
       run: cargo build --verbose
-    - name: Run tests
+    - name: Run Tests
       run: cargo test --verbose
     - name: Clippy
       run: cargo clippy -- -D warnings
+    - name: Format
+      run: cargo fmt --check