Is it possible to include all packages from GitHub at once in composer?

Question

GitHub

A private package can be connected by specifying a specific repository. Perhaps there is a way to set GitHub to be the second place where composer will look for a package that it could not find on its own?

"repositories": [ { "type": "composer", "url": "https://github.com/" } ],

To not list each separately. There are many and they are all on GitHub