drone CI, docker

.drone.yml

@@ -15,3 +15,13 @@ pipeline:
     commands:
       - ls -la
       - ./mark2web -in example -out html -create -logLevel debug
+
+  build_docker:
+    image: docker
+    commands:
+      - docker build -t apairon/mark2web .
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    when:
+      branch: master
+      event: push