Notifier: Discord

[lemonsaurus]

We should support webhooks to various services whenever a backup completes.

For our purposes, the most obvious webhook is to Discord. When the entire backup process completes, we want to send a webhook with a status report for the whole job.

For example, a report might look like this:

Postgres: [ok]
Redis: [ok]
Mongo: [failed]

[lemonsaurus]

Solved!