This will require the daemon to be running when launching GC, but
won't start it if it happens to not be running for some reason.
Change-Id: If48fe336030173f028428fc00a81d339ef4b8bce
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3015
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Adds a module that automatically collects garbage based on disk space
thresholds, and configures it to run hourly on whitby.
This is implemented as an alternative to cl/2937, which I've been told
uses a Nix feature that doesn't actually work.
Under-the-hood this is simply a systemd timer running a shell script
which checks available disk space and runs GC when necessary.
Change-Id: I3c6b5de85b74ea52e7e16c53f2f900e0911c9805
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3014
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
