CI: Add cargo clippy to detect code smells

Author: tuxuser

.github/workflows/test.yml

@@ -28,5 +28,8 @@ jobs:
       - name: Test
         run: cargo test
 
-      - name: Lint
-        run: cargo fmt --check
+      - name: Check formatting
+        run: cargo fmt --check
+
+      - name: Analyze code smells
+        run: cargo clippy