update drone file

.drone.yml

@@ -4,15 +4,16 @@ type: docker
 
 steps:
 - name: test
-  image: rust:alpine
+  image: rust:latest
   commands:
-  - cargo build --verbose --all
-  - cargo test --verbose --all
+  - cargo install just
+  - just test
 
 - name: build
   image: rust:alpine
   commands:
-      - cargo build --release
+      - cargo install just
+      - just dist
   when:
       event:
           - tag