drone. Adding .drone.yml CI configuration and build badge to README.md.

.drone.yml

@@ -0,0 +1,10 @@
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: validate
+    image: 'docker/compose:1.29.2'
+    commands:
+      - for DIR in */ ; do if [[ $DIR == _* ]] ; then continue; fi && test -f $DIR/.env.dist && cp $DIR/.env.dist $DIR/.env ; done
+      - for DIR in */ ; do if [[ $DIR == _* ]] ; then continue; fi && echo $DIR && cd $DIR && docker-compose config && cd .. ; done

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://ci.skobk.in/api/badges/skobkin/docker-stacks/status.svg)](https://ci.skobk.in/skobkin/docker-stacks)
+
 # Docker Compose config collection
 
 ## How to set up?