preserv ansible # jinja2 header

[nbari]

Preserves the jinja2 ansible headers # jinja2: like: # jinja2:lstrip_blocks: true

https://docs.ansible.com/ansible/latest/collections/ansible/builtin/template_module.html

Also, you can override jinja2 settings by adding a special header to template file. i.e.
#jinja2:variable_start_string:'[%', variable_end_string:'%]', trim_blocks: False

Useful when using jinja2.ansible:

#jinja2:lstrip_blocks: True
# ----------------------------------------------------------------------------
# {{ ansible_managed }}
# ----------------------------------------------------------------------------
---
global:
  resolve_timeout: 1m'

route:
...

Checklist

• Add test cases to all the changes you introduce
• Update the documentation for the changes

[lyz-code]

Thanks for the contribution :)