Migrating Sidekiq's Redis

We store our queue of jobs in a Redis instance. When / if we change hosting providors, we can't lose that data.

Here are the steps to do the migration:

1) Ensure that AOF persistence is enabled in the new server's Redis configuration, view Redis' docs for more context. This should be as simple as changing appendonly no to appendonly yes in the redis.conf (/etc/redis/redis.conf when using Hatchbox). 2) Install RIOT locally (or any where you like to work!). 3) Turn on maintenance mode and disable Sidekiq - this is to prevent new jobs being added to the queue. 4) Run the following command to migrate the keys from your old Redis instance to your new Redis instance:

```
riot replicate [old_connection_string] [new_connection_string]
```

If migrating from Heroku, you'll need to add `--source-insecure --no-ttl` [(context)](https://stackoverflow.com/questions/65042551/ssl-certification-verify-failed-on-heroku-redis/). Read more on [redis.github.io](https://redis.github.io/riot/#_replication).

5) Change REDIS_URL in your enviroment variables. 6) Turn off maintenance mode, enable Sidekiq and verify the queue has migrated!