line replacement of paperless-ngx config file fails on content in paperless_ngx_conf_filename_format

[borismw]

Steps to reproduce:

• define a storage path template with placeholders, e.g. '{% raw %}{{ created_year_short }}-{{ correspondent }}-{{ title }}{% endraw %}' in variable paperless_ngx_conf_filename_format
• execute role

What happens:
The role execution fails because created_year_short variable does not exist.

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Hi 👋🏾,

again thanks this ansible role. It made settings up paperless-ngx easy, event though documentation of the bare-metal route is a bit scarce. I ran into problems when defining a paperless_ngx_conf_filename_format as mentioned above. It seems that even when wrapped between {% raw %}...{% endraw %} the ansible.builtin.lineinfile task interprets the paperless-ngx specific placeholde syntax as Jinja variable expressions and tries to expand them. This of course leads to an error because the paperless-ngx specific text templates are not known to ansible.

I found out that by escaping the loop entry for paperless_ngx_conf_filename_format in the Write the paperless-ngx config file task in tasks/paperless_ngx/configuration.yml like so

    - pngx_var: PAPERLESS_FILENAME_FORMAT
      role_var: "{{ '{{' }} paperless_ngx_conf_filename_format {{ '}}' }}"

fixes the problem. But same as the issue I filed a few days ago I do not know if this solution fits in. However I will open up a PR soon. EDIT: see PR #242