Use cookiecutter _copy_without_render for github actions yaml files.

[DonalChilde]

Maybe this has already been discussed and discarded, but it looks like using _copy_without_render in the cookiecutter.json for the github action yaml files could avoid a lot of confusing nested curly braces. It allows you to copy files, without sending them to jinja for rendering.

https://cookiecutter.readthedocs.io/en/2.1.1/advanced/copy_without_render.html

My cursory inspection of the yaml files did not find any that made use of cookiecutter values.

[DonalChilde]

Or, use the {% raw %} {% endraw %} tags to avoid jinja processing by cookiecutter