Make the storage service to use for avatars configurable

app/models/user.rb

@@ -87,7 +87,7 @@ class User < ApplicationRecord
   scope :active, -> { where(:status => %w[active confirmed]) }
   scope :identifiable, -> { where(:data_public => true) }
 
-  has_one_attached :avatar
+  has_one_attached :avatar, :service => Settings.avatar_storage
 
   validates :display_name, :presence => true, :length => 3..255,
                            :exclusion => %w[new terms save confirm confirm-email go_public reset-password forgot-password suspended]

config/settings.yml

@@ -132,3 +132,5 @@ smtp_enable_starttls_auto: false
 smtp_authentication: null
 smtp_user_name: null
 smtp_password: null
+# Storage services
+avatar_storage: "local"

config/settings/test.yml

@@ -19,3 +19,5 @@ wikipedia_auth_id: "dummy"
 wikipedia_auth_secret: "dummy"
 # Server URL for testing
 server_url: "test.host"
+# Storage services for testing
+avatar_storage: "test"