Add code quality checks

.drone.yml

@@ -0,0 +1,39 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: fetch_dependencies
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    commands:
+      - cargo fetch
+
+  - name: code_quality
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    depends_on:
+      - fetch_dependencies
+    commands:
+      - rustup component add clippy
+      - cargo clippy -- -D warnings
+
+  - name: test
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    depends_on:
+      - code_quality
+    commands:
+      - cargo test
+
+volumes:
+  - name: rust_registry
+    temp: {}
+