Gem読込み前の環境変数設定を適切なinitializersに移動した

Gemfile

@@ -28,7 +28,7 @@ gem 'commonmarker'
 gem 'data_migrate'
 gem 'diffy'
 gem 'discord-notifier'
-gem 'discordrb', github: 'shardlab/discordrb'
+gem 'discordrb', github: 'shardlab/discordrb', require: false
 gem 'google-cloud-storage', '~> 1.25', require: false
 gem 'holiday_jp'
 gem 'jp_prefecture'

config/boot.rb

@@ -2,7 +2,3 @@
 
 require "bundler/setup" # Set up gems listed in the Gemfile.
 require "bootsnap/setup" # Speed up boot time by caching expensive operations.
-
-# NOTE: ボイス機能を使用しない設定です。
-#       https://github.com/shardlab/discordrb/wiki/Installing-libopus
-ENV['DISCORDRB_NONACL'] = 'true'

config/initializers/discord.rb

@@ -1,3 +1,8 @@
+# NOTE: ボイス機能を使用しない設定です。
+#       https://github.com/shardlab/discordrb/wiki/Installing-libopus
+ENV['DISCORDRB_NONACL'] = 'true'
+require 'discordrb'
+
 Rails.application.reloader.to_prepare do
   Discord::Server.configure do |config|
     config.guild_id = ENV['DISCORD_GUILD_ID'].presence