add drone config

.d

@@ -0,0 +1,13 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: compose_validate
+  image: ubuntu
+  commands:
+  - apt-get update && apt-get install --no-install-recommends -y docker-compose
+  - docker-compose config --services
+trigger:
+  branch:
+  - master