Add constant for /etc/pacman.conf

[codefiles]

Add the constant PACMAN_CONF for /etc/pacman.conf.

Introduce LPath, a subclass of pathlib.Path, to assist in swapping out the root with a target.

For example:

>>> from pathlib import Path
>>> from archinstall.lib.pathnames import PACMAN_CONF
>>> PACMAN_CONF
LPath('/etc/pacman.conf')
>>> PACMAN_CONF.relative_to_root()
LPath('etc/pacman.conf')
>>> target = Path('/mnt')
>>> pacman_conf = target / PACMAN_CONF.relative_to_root()
>>> pacman_conf
PosixPath('/mnt/etc/pacman.conf')

pathlib.Path has supported subclassing since Python 3.12.

https://docs.python.org/3/whatsnew/3.12.html

If this is merged then the plan will be to move more path constants like this to pathnames.py. I would also add more functionality to LPath to support other types of Linux path operations.

[codefiles]

Thanks Torxed, that was quick. Are you not merging because of the failing ruff checks or something else?

[Torxed]

Thanks Torxed, that was quick. Are you not merging because of the failing ruff checks or something else?

Mostly since you had an open question for @correctmost, letting them see and respond, also figured @svartkanin probably wanted to take a peek :)

[codefiles]

Good call. Thank you.