如果您想将 ssh 私钥或公钥放入环境变量并在 CI 系统上访问它怎么办？
一个键看起来像这样，那么如何将它转换为没有换行符的 Base64 字符串呢？
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACAICS0Scec9oD2raCs5HoZyQuZCPXJAVZvIJ+OooR0faAAAAJBsx4YgbMeG
IAAAAAtzc2gtZWQyNTUxOQAAACAICS0Scec9oD2raCs5HoZyQuZCPXJAVZvIJ+OooR0faA
AAAEDd1JmV4ligped6DH18jnlyEriUfNve+80vexKOOZjUwQgJLRJx5z2gPatoKzkehnJC
5kI9ckBVm8gn46ihHR9oAAAABmF3c2JvdAECAwQFBgc=
-----END OPENSSH PRIVATE KEY-----