update drone file

.drone.yml

@@ -6,8 +6,14 @@ clone:
   skip_verify: true
 
 steps:
-  - name: greeting
+  - name: build
-    image: alpine
+    image: rust:latest
     commands:
-      - echo hello
+      - cargo build --release
-      - echo world
+  - name: package
+    image: plugins/docker
+    settings:
+      repo: northcode/leetbot
+      registry: registry.local
+      dockerfile: Dockerfile
+      tags: latest