Trellis Doc is missing detail of file for fake ssl LE certificate config

Hi, I would like to know in wich file we’re supposed to add the letsencrypt_ca parameter to test with fake certificate of Let’s Encrypt? I you look in the doc:

It didn’t mention the name of the file only in a group_vars file. Which one?

Here the chunk in case:

Just set the following variable:

# in a group_vars file
letsencrypt_ca: ""

Thank you for adding this information or giving it to me please.

Thanks for Roots stack, it’s a really great dev solution for WP

Add it to group_vars/<environment>/main.yml