cache CI & fix clippy lint

.github/workflows/rust.yml

@@ -16,6 +16,22 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
+    - name: Cache
+      uses: actions/cache@v3
+      with: 
+        path: |
+          ~/.cargo/bin/
+          ~/.cargo/registry/index/
+          ~/.cargo/registry/cache/
+          ~/.cargo/git/db/
+          target/
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: ${{ runner.os }}-cargo-
+
+    - name: Lint
+      run: |
+        cargo fmt --all -- --check
+        cargo clippy -- -D warnings
     - name: Build
       run: cargo build --verbose
     - name: Run tests

.gitignore

@@ -3,10 +3,6 @@
 # will have compiled files and executables
 target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk