Skeleton project prompts for a token

When I run composer install in home directory of GitHub - slimphp/Slim-Skeleton: Slim Framework 4 Skeleton Application it runs for a long time (it isn’t slim after all) and then pauses here:

- Syncing phpstan/phpstan (0.12.85) into cache
Cloning failed using an ssh key for authentication, enter your GitHub credentials to access private repos
Head to
to retrieve a token. It will be stored in "/root/.composer/auth.json" for future use by Composer.
Token (hidden):

This is problematic because it will break automatic deployment / installation when no human is available to provide a token. How do we work around this?

Have you tried this?

Read more: Authentication for privately hosted packages and repositories - Composer