feat(ops/modules): Add module for automatically collecting garbage r/2511

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>

0 files changed, 0 insertions, 0 deletions