ci: change drone.yml

.drone.yml

@@ -1,5 +1,5 @@
 kind: pipeline
-type: exec
+type: docker
 name: hello-drone
 
 platform:
@@ -8,6 +8,7 @@ platform:
 
 steps:
 - name: build
+  image: golang-alpine
   commands:
     - go build
     - go test