Add clippy in CI workflow

Author: wuwbobo2021

.github/workflows/rust_nightly.yml

@@ -19,5 +19,7 @@ jobs:
     - run: rustup component add rustfmt
     - name: Check fmt
       run: cargo fmt -- --check
+    - name: Clippy
+      run: cargo clippy -- -Dwarnings
     - name: Test
       run: cargo test