Update init-letsencrypt.sh

[pcarioufr]

Thanks for this :-) 👍 It was really helpful !

I think this would help:

• fix loop on domains for dummy certificates
• create bigger SSH Key (4096) as 1024 would fail with current nginx version

[williamforster]

Thanks for the guide, +1 to changing ssh key to 4096, nginx does not accept key at current length