created drone config (ros-navigation#342)

* created drone config

* fixes #2

* changes to drone ci

.drone.yml

@@ -0,0 +1,33 @@
+---
+# 1.  PR validation
+kind: pipeline
+type: docker
+name: PR validation step
+
+platform:
+  arch: amd64
+  os: linux
+
+trigger:
+  event:
+    include:
+    - pull_request
+
+volumes:
+- name: dockersock
+  host:
+    path: /var/run/docker.sock
+
+image_pull_secrets:
+- dockerconfig_prd
+
+steps:
+- name: Rebuild nav2 and run tests
+  image: quay.io/logivations/ml_all:latest
+  volumes:
+  - name: dockersock
+    path: /var/run/docker.sock
+  commands: 
+  - cd /code/ros2_ws/src/navigation2 && git fetch --all && git checkout ${DRONE_SOURCE_BRANCH}
+  - cd /code/ros2_ws && colcon build --packages-up-to amr_system_tests
+  - cd /code/ros2_ws && colcon test --packages-select amr_system_tests