Cannot install dependency from private package registry in CI/CD

[wolfm89]

Description of Problem, Request, or Question

I am using Gitlab to build a package that has a dependency on another package in a private registry.
After specifying CONAN_LOGIN_USERNAME: "ci_user" and CONAN_PASSWORD: ${CI_JOB_TOKEN} I can upload to the repo's registry. But even though I specify CONAN_LOGIN_USERNAME_other_repo: "ci_user" and CONAN_PASSWORD_other_repo: ${CI_JOB_TOKEN} conan cannot pull the dependency and always fails with conans.errors.NotFoundException: Unable to find 'my_package/1.0@company/stable' in remotes.
I checked the source code and to me it looks like remote authentication only happens for package uploads. Could that be?
It seems like CPT never tries to login to my other registry before trying to pull from there.

Environment Details

• Conan Package Tools Version: 0.35.1
• Operating System: Linux
• Operation System Version: Ubuntu 20.04
• Compiler+version: gcc-10
• Docker image: conanio/gcc10
• Conan version: conan 1.39.0
• Python version: python 3.7.5

[Parcley]

I am wondering if cpt could provide a solution for this, as in our project we are facing the same issue.

maybe this is related to #417