Match against having letters and numbers for environment name
What does this MR do?
Match against having letters and numbers for environment name
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer
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What are the relevant issue numbers?
Fix the mistake in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20523#43849bacd67dda1f66ae94f152ba926b01c7df79