Merge branch 'sh-fix-role-arn-injection' into '18-11-stable'

Axel von Bertoldirequested to merge
avonbertoldi/105-backport-18-11 into 18-11-stable

Merge https://gitlab.com/gitlab-org/security/gitlab-runner/-/merge_requests/105+ into canonical 18-11-stable.

Edited by Axel von Bertoldi

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