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安装教程参考：
https://blog.csdn.net/ldy1016/article/details/78849615
全程流程，在步骤：
bundle install
出现错误：
Error installing rmagick:
ERROR: Failed to build gem native extension.
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
注意：bundle install命令需要在redmine文件夹下执行
经翻江倒海一般的查询后，试验无数确认错误，见下链接：