fix: ci

.github/workflows/rust.yml

@@ -10,10 +10,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+      - name: Cache
+        uses: swatinem/rust-cache@v2
+      - name: Check formatting
+        run: cargo fmt -- --check
       - name: Build
         run: cargo build --verbose
       - name: Run tests
         run: cargo test --verbose
       - name: Run clippy
-        run: cargo clippy --verbose
+        run: cargo clippy -- -D warnings
+