cron job for deleting temp files

[CBroz1]

Is your feature request related to a problem? Please describe.

Currently, we have use a temp directory for the following...

1. decoding.v1.waveform_features: spikeinterface's extract_waveforms
2. spikesorting.v0.spikesorting_sorting: spikeinterface's run_sorter
3. spikesorting.v1.metric_curation: spikeinterface's extract_waveforms
4. spikesorting.v1.sorting: spikeinterface's run_sorter
5. position.v1.dlc_utils_makevid: store frames before assembling into video

... but no process that cleans up these files. Some spikesorting processes use a uuid from the key that would change if deleted and rerun. We expect disk space to eventually be an issue, and this is an easy place to save the end-user from making tougher decisions.

Describe the solution you'd like

A cron job that deletes files with a modification timestamp older than 7 days, and documentation for setting up this cron job.

Describe alternatives you've considered

Manual intermittent deletion.

Additional context

n/a