Storage option

[Gurpartap]

I'll submit a PR if I do end up using acmeproxy. ;)

Being able to plug a different cert storage option[1] (s3, consul, etc.) would be helpful.

I'm currently using certmagic with consul storage[2], and considering moving certificate management to a proxy process instead.

[1] https://github.com/mholt/certmagic/wiki/Storage-Implementations

[2]

// assuming default consul api url
storage, err := storageconsul.NewConsulStorage()
if err != nil {
	return err
}

cfg.Storage = storage

[mdbraber]

Sounds good. I only use certmagic for the storage of acmeproxy's own SSL certificate, but as you mentioned - adding an alternative storage provider isn't too hard. Let me know if you need any help!