Docker Secret for CF_TOKEN

In your alpine-cloudflare-dyndns image, it would be great to have to option to use a docker secret instead of an environment variable for the CloudFlare API key.

Thanks for the image!

Actually, it might also be helpful to have CF_DOMAIN_NAME also setup to work with secrets

[ellerbrock]

hi @rubidot,

yes your right, since secrets are now available this makes sense.
can you make a pr for the change please?

cheers maik