Add cross-platform binaries to github releases about certstrap

[geofffranks]

Any thoughts on this? I'd be more than happy to help.

[mcpherrinm]

Seems good. It's mostly a matter of figuring out a travis-ci script to save binaries (and appveyor for a Windows .exe too). I guess the thing to use is "github releases".

[alokmenghrajani]

👍 for setting some kind of automated script. We should do it for all our Go repos.

[beneshed]

+1

[mikesimons]

Here are a couple of examples on how to do this by cross compiling all three binaries on travis.

https://github.com/mozilla/sops/blob/master/.travis.yml
https://github.com/mikesimons/pacyak/blob/master/.travis.yml

These are both set to deploy a release when a commit is tagged.

[mcpherrinm]

Thanks for linking those references; this looks pretty straightfoward.

[tboerger]

Looks like this have been merged.

[csstaub]

Yep, it has :)