Dump old logs to somewhere cheap

[reefdog]

We just added logrotate, which kills logs older than 5 days. That should help prevent logs from filling up our storage, but it means we lose historical logs.

We should explore moving old logs to something like S3 so we can still access them for historical forensics.

[slifty]

This StackOverflow question seems to have a potential clue for doing this: https://stackoverflow.com/questions/54457314/logrotate-move-only-the-new-compressed-files-to-s3