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RailsのProductionでpublic配下のimageが404

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本番の構築時にはまったのでメモしておく

DevelopmentやStagingでは表示されていたのに、本番環境ではimageが軒並み404で応答されていた。

config/environments/production.rbに下記を追加する
config.public_file_server.enabled = true

public配下の静的ファイルを取得するためにはこの設定が必要

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