Document how to access and modify a user's filesystem

[choldgraf]

Context

In a recent incident we needed to modify a file in a user's home directory, but the file was preventing hub sessions to start. We weren't sure how to modify the file without spawning a user's session.

We realized that this was possible via exec-homes-shell which is documented in the deployer module.

This is documented ininfrastructure/ as part of deleting a hub, but not in the context of accessing / modifying a user's filesystem.

Proposal

We should have a section in infrastructure/ that is called something like ## How to access and modify a user's filesystem. This is where our documentation about exec-homes-shell should live, and the "move a hub" docs should reference this section. This would make the information more glanceable and discoverable.

Updates and actions

No response