Added drone build

.drone.yml

@@ -10,7 +10,17 @@ steps:
   image: hseeberger/scala-sbt:11.0.2_2.12.8_1.2.8
   commands:
   - sbt test
-- name: docker:publish
+- name: dockerfile
   image: hseeberger/scala-sbt:11.0.2_2.12.8_1.2.8
   commands:
-  - sbt docker:publish
+  - sbt docker:stage
+- name: docker
+  image: plugins/docker
+  settings:
+    repo: https://registry.xeppaka.eu:443
+    tags: 1.0.0
+    dockerfile: target/docker/stage/Dockerfile
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password