Revert "remove drone config"

This reverts commit c11032cf82.

.drone.yml

@@ -0,0 +1,13 @@
+---
+kind: pipeline
+name: deploy to swarm.autonomic.zone
+steps:
+  - name: deployment
+    image: decentral1se/stack-ssh-deploy:0.0.1
+    settings:
+      stack: well-known-uris
+      deploy_key:
+        from_secret: drone_deploy_key
+trigger:
+  branch:
+    - master