https://devcenter.heroku.com/articles/custom-domains http://thenomadicfreelancer.blogspot.com/2012/08/pointing-godaddy-domain-to-your-heroku.html
For each custom subdomain use domains:add in the Terminal.
YahiaBadr
/ gist:93dd80310a6d8fd2d4a6a8e22d2cfbd6
Created
October 14, 2019 22:51
— forked from mikestone14/gist:11198630
Getting a GoDaddy domain to point to a Heroku app.