Add Ansible-lint CI step (#4411)

* Add ansible-lint as gitlab-ci step

* Fix jinja2 syntax in include_tasks that breaks ansible-lint

* Use a block scalar to get around gitlab quoting/escaping rules

* Run ansible-lint in verbose mode in CI

.gitlab-ci.yml

@@ -731,6 +731,14 @@ yamllint:
     - yamllint .
   except: ['triggers', 'master']
 
+ansible-lint:
+  <<: *job
+  stage: unit-tests
+  # lint every yml/yaml file that looks like it contains Ansible plays
+  script: |-
+    grep -Rl '^- hosts: \|^  hosts: \|^- name: ' --include \*.yml --include \*.yaml . | xargs ansible-lint -v
+  except: ['triggers', 'master']
+
 tox-inventory-builder:
   stage: unit-tests
   <<: *job