【docker】docker-compose build したらERROR: Service 'web' failed to build : The command '/bin/sh -c bundle install' returned a non-zero code: 7 - Qiita

railsアプリにローカル環境にdockerを導入していました。buildしようと、docker-compose buildを実行したら、このようなエラーがでました。 Your bundle is locked to mimemagic (0.3.5), but that version could not be found in any of the sources listed in your Gemfile. If you haven't changed sources, that means the author of mimemagic (0.3.5) has removed it. You'll need to update your bundle to a version other than mimemagic (0.3.5) that hasn't been remove