You need to run a replace command in the internal NGINX.
After making the changes, look at the actual file on disk to confirm that you got what you wanted.
A trick I use is:
- ./launcher enter app
- cd
/etc/nginx/conf.d/
- edit the discourse.conf file
- sv restart nginx
- see that my desired effect was achieved
- turn that change into a yml
replace
command - rebuild
- confirm file is good