Add format check to CI

.github/workflows/rust.yml

@@ -10,7 +10,7 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
+  build_and_test:
 
     runs-on: ubuntu-latest
 
@@ -20,3 +20,18 @@ jobs:
       run: cargo build --verbose
     - name: Run tests
       run: cargo test --verbose
+
+  format:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Setup toolchain
+        uses: actions-rs/[email protected]
+        with:
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - uses: actions/checkout@v3
+      - name: Run rustfmt
+        run: cargo fmt --check