add drone config

.drone.yml

@@ -0,0 +1,13 @@
+kind: pipeline
+name: default
+
+steps:
+- name: docker
+  image: plugins/docker
+  network_mode: bridge
+  settings:
+    repo: sneak/sco
+    dry_run: true
+    tags:
+      - ${DRONE_COMMIT_SHA}
+      - ${DRONE_BRANCH}