Nix support 2.0

[Simon-Weij]

I packaged winboat again, with a couple of changes.

Over the current flake:
Packages the tarball instead of the appImage, this solves a couple isolation issues (like not detecting the docker group)

Uses the tarball from the release, this will eventually make it easier to merge winboat into nixpkgs

Doesn't package freerdp, this should help with a bug where freerdp showed a black box and instantly crashes (see note)

It tries to keep stuff pretty minimal so there won't be many nix-specific bugs

Workflow to update the hash, which I've tested and should work fine. But obviously it hasn't been tested on the main repository

This pr should fix issue #171 and #164

NOTE:
The black box still happens sometimes, this package works 100% fine on my desktop, but the bug occurred on my laptop, which later resolved itself, I'm not entirely sure how to reproduce this, but this version should work for more people than the current version that packages the appImage.

[Simon-Weij]

Note about the note, the black box bug most likely has nothing to do with the nix package, but it was a thing of freerdp when you have the windows desktop open, it can't open apps.

[TibixDev]

Thanks, hopefully this will work better for Nix folks. 🙏

[xrexy]

@TibixDev PR didn't close the related issues

[realitymolder]

@Simon-Weij thanks for the hard work. Seems like you removed the support of the module?
Before the nix flake would allow the user to call services.winboat.enable = true; and it took care of everything for the user.
I'm asking because I want to write those things in the docs :)

[Etmix]

#170 Handles the documentation.
We should probably bring back the module and validate that rootless is disabled to avoid the issue in #171.

[Simon-Weij]

This flake is pretty much from scratch again, I or someone else can re-add the module if you ask me.

[ppom0]

I was close to finishing packaging winboat from source for Nix, you may be interested: NixOS/nixpkgs#440321
I think with current flake, my attempt, and last module, an upstream package can be made.