DEBUG: run unit tests 5 times in CI to try to raise the panic error

During release testing, some of the builds did raise a panic during unit
tests. I can't manage to reproduce it locally, so let's try in GitLab

For instance, see this unit test run from GitLab:
  https://gitlab.com/Northern.tech/Mender/mender-artifact/-/jobs/269428923

Changelog: None

Signed-off-by: Lluis Campos <lluis.campos@northern.tech>
5 jobs for pr_213 in 2 minutes and 17 seconds (queued for 1 second)
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