Add S3 config file (without specific info)
user
```ruby
CarrierWave.configure do |config|
  config.fog_credentials = {
      :provider               => 'AWS',                        # required
      :aws_access_key_id      => 'xxx',                        # required
      :aws_secret_access_key  => 'yyy',                        # required
      :region                 => 'eu-west-1',                  # optional, defaults to 'us-east-1'
      :host                   => 's3.example.com',             # optional, defaults to nil
      :endpoint               => 'https://s3.example.com:8080' # optional, defaults to nil
  }
  config.fog_directory  = 'name_of_directory'                     # required
  config.fog_public     = false                                   # optional, defaults to true
  config.fog_attributes = {'Cache-Control'=>'max-age=315576000'}  # optional, defaults to {}
end```
assistant