Prepare transition to Gitea, set up Drone CI

.drone.yml

@@ -13,6 +13,6 @@ steps:
   - name: ansible-lint
     image: python:3.9-alpine
     commands:
-    - pip install ansible-lint==4.3.7
-    - ansible-lint *.yml
+      - pip install ansible-lint==4.3.7
+      - ansible-lint *.yml
 ...