adds drone ci config

.drone.yml

@@ -0,0 +1,17 @@
+kind: pipeline
+name: default
+
+steps:
+- name: docker
+  image: plugins/docker
+  network_mode: bridge
+  settings:
+    repo: sneak/uhub
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
+    tags:
+      - ${DRONE_BRANCH//\//-}-${DRONE_COMMIT_SHA:0:8}
+      - ${DRONE_COMMIT_SHA}
+      - ${DRONE_BRANCH/\//-}