Add drone config

.drone.yml

@@ -0,0 +1,18 @@
+kind: pipeline
+type: docker
+name: build
+steps:
+  - name: build
+    image: plugins/docker
+    settings:
+      username:
+        from_secret: REGISTRY_USER
+      password:
+        from_secret: REGISTRY_PASSWORD
+      storage_driver: vfs
+      registry: docker.r4o.ch
+      repo: docker.r4o.ch/docs
+      auto_tag: true
+
+image_pull_secrets:
+- dockerconfig