Fix: increase max number of domains to 100 (match with Let's Encrypt)

[davidindra]

CC @jc21

Let's make the limit of domains count equal to the Let's Encrypt limit, as suggested here #3382 (comment), when the limit was raised from 15 to 30 in last December.

In my use case, I have a big SAN cert - lots of subdomains and "www." is needed to be supported too, so everything twice; I am not able to configure this in nginx-proxy-manager at the moment.

ref: #3218, #3382

I would be glad if you could approve & merge this change :)
Thx and have a nice day,

D.

[nginxproxymanagerci]

Docker Image for build 2 is available on DockerHub as jc21/nginx-proxy-manager:github-pr-3581

Note: ensure you backup your NPM instance before testing this PR image! Especially if this PR contains database changes.

[davidindra]

Thanks @jc21! 🙂 Could you say when you will make a new release to the :latest Docker tag?