Support (optional) Cloudflare proxied record creation

[jimcavoli]

Given the split of box vs app concerns, and the new addition of being able to separate the mail server from the my subdomain, it would be a great added feature to have the option to check a box for setting up proxied records when using the Cloudflare DNS provider.

Previous discussion: https://forum.cloudron.io/topic/2806/is-the-cloudflare-auto-dns-setup-secure-using-dns-only-as-opposed-to-proxied/

[theCiscoGeek]

I'd like to add a comment onto this because it's a closely related technical consideration.

When proxying through Cloudflare, some container operations may hang at "Configuring - Waiting for DNS propagation" because they are looking for the public IP (or other configured, single IP) of the Cloudron host to be on the dns record which won't be a match for the Cloudflare proxied DNS records. Cloudflare does publish their ranges, which may be useful for validation purposes when/if this feature is introduced.

[girish]

@theciscogeek When using Cloudflare, we have a check as to whether it's proxying and we skip the DNS propagation checks - https://git.cloudron.io/cloudron/box/-/blob/master/src/dns/cloudflare.js#L274