Add cargo fmt to the CI

.github/workflows/ci.yml

@@ -34,6 +34,16 @@ jobs:
         with:
           command: test
           args: --verbose
+  formatting:
+    name: Cargo fmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          components: rustfmt
+      - name: Rustfmt Check
+        uses: actions-rust-lang/rustfmt@v1
   cargo-deny:
     name: Check dependencies
     runs-on: ubuntu-latest