feat(release): fallback to predefined CI/CD variable for default branch

Timo Furrerrequested to merge
fallback-default-branch-release into main

Description

  • feat(release): fallback to predefined CI/CD variable for default branch

This change set adds a fallback to the predefined CI/CD variable when trying to determine the default branch of a project when a release should be created without an explicitly specified ref and without access to the Projects API.

That is the case when running in CI with a CI Job Token that doesn't have access to that particular API, but releasing from CI is a very common use case.

This is especially useful with the newly introduced GLAB_ENABLE_CI_AUTOLOGIN feature.

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