Allow for multiple versions

[JonBoyleCoding]

I added in my own repository the ability for the flake to handle multiple versions via overrideAttrs. It obviously requires a hash for each version, so I've added in all the ones I've had access to.

This might cause issues if you need a different setup script for each version... But as far as I could tell there was little that would cause an issue at the moment.

Don't know if you want this, but thought I would submit a PR in case you do!

[reckenrode]

Thanks for the contribution.

I’m getting to a point with NixOS/nixpkgs#234710 where I’m mostly just waiting on PRs to be merged. I have some time in the coming weeks when I should start being able to make some progress on #6. I’m going to merge this so users can stay updated and use a particular version more easily.

[mfenniak]

Just wanted to share a thought looking at this -- there might be unexpected compatibility issues in this PR since node.js dependencies from different versions are being used.

If it works, it works -- but I suspect some different handling might be needed in the long-term as more divergence in the dependencies occurs. :-) I know you mentioned some plans in #6 though; hopefully that would help.

[reckenrode]

My plan for #6 is to have separate attributes (foundryvtt_9, foundryvtt_10, foundryvtt_11, etc) for those who need specific versions with foundryvtt defaulting to the latest stable. They’ll use whatever dependencies are appropriate.