Documentation for using systemd path units with Warewulf runtime overlays

[anderbubble]

Summary

Document using systemd path units to run commands or restart services when files change (presumably when changed by Warewulf).

We'll want to confirm that this doesn't fire when the file doesn't change (though I'm afraid that right now it will, because Warewulf always overwrites the file, even if it hasn't changed).

https://www.freedesktop.org/software/systemd/man/latest/systemd.path.html

Rationale

Right now, Warewulf provides a facility for placing files on cluster nodes; but it doesn't provide functionality for taking actions on the system (e.g., restarting services) when those files change. This is a potential way to do that.

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General information

• I have searched the issues of this repo and believe this is not a duplicate