Formulas are imported from external repositories where you can build up an
entire ecosystem of components to be installed on a Stack.
stackd.io has a set of supported formulas located at
https://github.com/stackdio-formulas.
Either select one of these formulas from the dropdown, or copy-and-paste the
clone URL from a different repository.
Note: If your repository requires username/password authentication,
you must include them in the repository URL like this:
https://<user>:<pass>@<hostname>/<repo>.git
PLEASE do not use your real user password here, as it will be stored in plain text.