今天我尝试为我的 rails 6.1.0 构建一个带有活动存储的 docker，我收到以下错误：
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 removed in order to install.
现在我尝试安装 mimemagic
gem install mimemagic -v 0.3.5
我有以下错误：
ERROR: Could not find a valid gem 'mimemagic' …