Send Rails logs to a (free) service

[cander]

Background

Send the Ruby on Rails logs to a service so that they can be viewed. This is specifically about the Rails logs, so it sounds more specific than #77. At the moment, our log volume should be pretty minimal (in the KBs/day), and our retention period can be minimal - 3 days would be OK, 7 would be better. Multiple users isn't really necessary yet - we can share a login. Fly.io captures some logs, but there's no retention or search that I know of. The last time I looked, Loggly still has a free tier.

Acceptance Criteria

• Rails logs are sent to a service that provides 3 or more days of retention and search.

Approach

• Survey log services looking at Rails integration (should be trivial) and cost
• Set up an account
• Configure Rails - shouldn't need any coding.

[cander]

I opened an account with Loggly. It should be free forever with a 7 day retention period. I'm a little suspect because they're owned by SolarWinds now, but we'll see.