Janitoring script

[jeremyestein]

Add container that deletes old files that we have created, with configurable thresholds.

Currently hard-coded in dry run mode and with read-only host mounts. We only report via telemetry the amount we would have deleted. We may keep it this way for some time, especially if we can get some more disk space.

[codecov]

Codecov Report

❌ Patch coverage is 79.10448% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.71%. Comparing base (ef9851f) to head (8eccc21).

Files with missing lines	Patch %	Lines
monitoring/janitor.py	85.48%	6 Missing and 3 partials ⚠️
monitoring/monitor.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #99      +/-   ##
==========================================
+ Coverage   69.92%   72.71%   +2.78%     
==========================================
  Files          14       15       +1     
  Lines         675      722      +47     
  Branches       61       67       +6     
==========================================
+ Hits          472      525      +53     
+ Misses        184      175       -9     
- Partials       19       22       +3     

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[skeating]

cool