Load OmniauthTenantSetup inside a lambda

This way we avoid loading the OmniauthTenantSetup in the initializer,
which could be problematic when switching to Zeitwerk.

app/lib/omniauth_tenant_setup.rb

@@ -1,27 +1,19 @@
 module OmniauthTenantSetup
   class << self
-    def twitter
-      ->(env) do
-        oauth(env, secrets.twitter_key, secrets.twitter_secret)
-      end
+    def twitter(env)
+      oauth(env, secrets.twitter_key, secrets.twitter_secret)
     end
 
-    def facebook
-      ->(env) do
-        oauth2(env, secrets.facebook_key, secrets.facebook_secret)
-      end
+    def facebook(env)
+      oauth2(env, secrets.facebook_key, secrets.facebook_secret)
     end
 
-    def google_oauth2
-      ->(env) do
-        oauth2(env, secrets.google_oauth2_key, secrets.google_oauth2_secret)
-      end
+    def google_oauth2(env)
+      oauth2(env, secrets.google_oauth2_key, secrets.google_oauth2_secret)
     end
 
-    def wordpress_oauth2
-      ->(env) do
-        oauth2(env, secrets.wordpress_oauth2_key, secrets.wordpress_oauth2_secret)
-      end
+    def wordpress_oauth2(env)
+      oauth2(env, secrets.wordpress_oauth2_key, secrets.wordpress_oauth2_secret)
     end
 
     private

config/initializers/devise.rb

@@ -270,22 +270,22 @@ Devise.setup do |config|
   config.omniauth :twitter,
                   Rails.application.secrets.twitter_key,
                   Rails.application.secrets.twitter_secret,
-                  setup: OmniauthTenantSetup.twitter
+                  setup: ->(env) { OmniauthTenantSetup.twitter(env) }
   config.omniauth :facebook,
                   Rails.application.secrets.facebook_key,
                   Rails.application.secrets.facebook_secret,
                   scope: "email",
                   info_fields: "email,name,verified",
-                  setup: OmniauthTenantSetup.facebook
+                  setup: ->(env) { OmniauthTenantSetup.facebook(env) }
   config.omniauth :google_oauth2,
                   Rails.application.secrets.google_oauth2_key,
                   Rails.application.secrets.google_oauth2_secret,
-                  setup: OmniauthTenantSetup.google_oauth2
+                  setup: ->(env) { OmniauthTenantSetup.google_oauth2(env) }
   config.omniauth :wordpress_oauth2,
                   Rails.application.secrets.wordpress_oauth2_key,
                   Rails.application.secrets.wordpress_oauth2_secret,
                   client_options: { site: Rails.application.secrets.wordpress_oauth2_site },
-                  setup: OmniauthTenantSetup.wordpress_oauth2
+                  setup: ->(env) { OmniauthTenantSetup.wordpress_oauth2(env) }
 
   # ==> Warden configuration
   # If you want to use other strategies, that are not supported by Devise, or