[resources/templates] Ability to ignore some files

I'm using the resources' templates/by-{group,host}/ path a lot to easily track and deploy files to servers.

However, it also send Vim's swap files, which sometimes break Jinja2 templating engine (see below).

Is there a way to ignore some files to be sync'ed through resources' templates?

Example of breaking Jinja2 templating:

"src": "/home/mathieu/dev/ansible/resources/templates/by-group/squid_servers/var/www/html/.config.pac.swp",
[...],
"msg": "AnsibleError: template error while templating string: unexpected char \'!\' at 12119.
String: b0VIM 8.2\\u0000\\u0000\\u0000\\u0000\\u0010\\u0000[...]

Of course, in the meantime, I simply changed Vim's temporary saving path (see Change Default Storage Location). But still I think adding ignoring feature to resources could be helpful.

Start by tracing how the resources/templates/by-{group,host}/ paths are collected and synchronized, then check whether existing configuration or tests cover file selection. The change is done when users can specify files to ignore and Vim swap files are excluded before Jinja2 templating without affecting other resources.