Adding files to gitlab's website

So I run gitlab on my own server updated it yesterday to the newest version. I’m going to link my gitlab to a domain name which I already created with an srv record.

Next thing is to validate my ssl certificate that i bought and reconfigure it using https.
For the ssl cert validation I chose httpvalidation. This means that i have to upload a file in the websiote directory of gitlab ~/.wellknown/pki-validation.

My question is where is gitlab’s webui stored. apparently there isn’t a /var/www.
kind regards.