```ruby
Sidekiq.configure_server do |config|
  config.redis = { url: "redis://#{REDIS_HOST}:6379/0" }
end

Sidekiq.configure_client do |config|
  config.redis = { url: "redis://#{REDIS_HOST}:6379/0" }
end
```

Fix errant ENV reference to REDIS_HOST
user
```ruby
Sidekiq.configure_server do |config|
  config.redis = { url: "redis://#{ENV['REDIS_HOST']}:6379/0" }
end

Sidekiq.configure_client do |config|
  config.redis = { url: "redis://#{ENV['REDIS_HOST']}:6379/0" }
end
```
assistant