debian: Set debian-branch to main
Make gbp happy and avoid the following error:
gbp:error: You are not on branch 'master' but on 'main'
gbp:error: Use --git-ignore-branch to ignore or --git-debian-branch to set the branch name.How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
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Make gbp happy and avoid the following error:
gbp:error: You are not on branch 'master' but on 'main'
gbp:error: Use --git-ignore-branch to ignore or --git-debian-branch to set the branch name.