Group Override with GITLAB_GROUP Environment Variable

Problem to solve

As a glab user, I usually work on a sub-tree of GitLab, a nested structure of groups and sub-groups.

Therefore, I would be glad if I could easily specify my preferred default group (i.e., the root group) where I do most of the work.

For the (default) repository (--repo option), a similar solution exists by setting the GITLAB_REPO environment variable.

Proposal

Therefore, I propose to set GITLAB_GROUP variable (or similar) which could be the default group that is used for these commands (if no --group is given):

• glab issue ls
• glab mr ls
• glab variable ls

This will speed up listing of issues in a certain sub-tree of the GitLab group hierarchy, because it is not required to specify the --group option for repeated list commands.