Tighten cache key sanitation (!5719) · Merge requests · GitLab.org / gitlab-runner · GitLab

What does this MR do?

Tighten cache key sanitation.

Why was this MR needed?

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What's the best way to test this MR?

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What are the relevant issue numbers?

closes: gitlab#506381 (closed)
closes: https://gitlab.com/gitlab-org/gitlab/-/issues/513177