How to add a subdomain or mapped domain to a MS installation secured with Let's encrypt

Hi, since it took me some time to figure out how to add secured subdomains and mapped domains to an MS install, I thought this might helpful to somebody else, so here it is.

Assuming the WP MS installation is running on maindomain.com and we are adding newdomain.com

#create subdomain / domain to map with php and letsencrypt certificate
ee site create newdomain.com --php --le

This will create a secured php site, that we now need to direct to the MS installation while insuring the LE certificate can be renewed automatically. So now:

#edit the site to allow for automatic let's encrypt renewal
ee site edit newdomain.com

On the configuration file, change

    root /var/www/newdomain.com/htdocs;

For

    root /var/www/maindomain.com/htdocs;

    #entry to allow for automatic letsencrypt certfificate updates
    location ~ /\.well-known{
        allow all;
        root /var/www/newdomain.com/htdocs;
    }

TEST That everything is running as expected.

Let me know if it works for you or you have better configuration suggestions!

Cheers.

PS. a probably better way to make sure you configured everything correctly is installing let's encrypt last:

    ee site create newdomain.com --php
    ee site edit newdomain.com
    ee site update newdomain.com --le