Fix the file syntax by writing the newline
character to the boto file.

Changelog: fixed

Toolbox: Fix boto config when using Workload Identity [Backport 19.0]

See merge request !5075



Merged-by: Clemens Beck <cbeck@gitlab.com>
Approved-by: Clemens Beck <cbeck@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: Stefan Bordei <sbordei@gitlab.com>
Co-authored-by: Alan Richman <alanrichman@duck.com>

Fixes Container Registry becoming inaccessible due to
automatic enablement of database prefer mode.

Relates gitlab-org/gitlab#600955

Changelog: fixes

10-0 stable Bump Container Registry to v4.40.1-gitlab

See merge request !5080



Merged-by: Clemens Beck <cbeck@gitlab.com>
Approved-by: Clemens Beck <cbeck@gitlab.com>
Reviewed-by: GitLab Duo <gitlab-duo@gitlab.com>
Co-authored-by: Hayley Swimelar <hswimelar@gitlab.com>

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