Adds ruby/dane

[jasonb5]

Adds config/spack files for LLNL's ruby/dane machines.

[xylar]

@jasonb5, this looks promising! I'll be making a new mache release (1.27.0) quite soon. Let me know if these additions are ready to be included in that and how you'd like me to review (since I don't have access to these machines).

Also, let me know if you need me to explain anything in mache, given that the documentation is so sparse. It seems like you've basically got it figured out but spack in particular can be pretty confusing and futzy.

[jasonb5]

@xylar I'm hoping to get this wrapped up today, I'll be out of office until the new year. I'm just sorting out some machine specific issues. I'm not sure how to proceed with reviewing, @chengzhuzhang is testing it locally on ruby but dane is down at the moment. I don't think that's too much of a problem since the machines are very similar in environments.

[chengzhuzhang]

I'm not sure how to proceed with reviewing

I think we can keep this PR open until we can test on dane. @xylar I think we may have another mache release in concurrent with the February e3sm-unified release?