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

.ansible-lint

@@ -0,0 +1,25 @@
+---
+parseable: true
+skip_list:
+  # see https://docs.ansible.com/ansible-lint/rules/default_rules.html for a list of all default rules
+  # The following rules throw errors.
+  # These either still need to be corrected in the repository and the rules re-enabled or they are skipped on purpose.
+  - '102'
+  - '103'
+  - '104'
+  - '201'
+  - '204'
+  - '206'
+  - '301'
+  - '302'
+  - '303'
+  - '305'
+  - '306'
+  - '403'
+  - '404'
+  - '502'
+  - '503'
+  - '504'
+  - '601'
+  - '602'
+  - '701'