hypridle: add `systemdTarget` option

[gmvar]

Description

• added systemdTarget option
• updated test to include new option
• added documentation link to systemd service

Checklist

• [x] Change is backwards compatible.

• [x] Code formatted with ./format.

• [x] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• [x] Test cases updated/added. See example.

• [x] Commit messages are formatted like

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  {long description}

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• If this PR adds a new module

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Maintainer CC

@khaneliman @fufexan

[khaneliman]

Looks like a duplicate of https://github.com/nix-community/home-manager/pull/5981

[gmvar]

Looks like a duplicate of #5981

🤦

It is in fact a duplicate. My fault for not bothering to search the open PR's.

[tristanbeedell]

If you want this can just orphan my PR, since something messed up the test pipelines on that branch anyway. Only difference is I also added a systemd.enable option, don't know if that necessarily would be of much value?

[gmvar]

I’m okay with having this PR take over the other one. I did consider adding a systemd.enable option, but since this is a service, I’m not sure what a value of false would provide. I assume it would just generate the config? Also, since it's a service, I don’t think home-manager adds hypridle to the PATH, so that might be something to keep in mind.

I'm not opposed to adding it, so please let me know if this is an option that we would like to have.

[tristanbeedell]

Cool, that's all fine by me, I'll close my PR. Thanks