Update GitLab Runner Helm Chart to 0.8.0/12.2.0

Tomasz Maczukinrequested to merge
update-gitlab-runner-helm-chart-to-0-8-0 into master

Update the gitlab/gitlab-runner requirement for 0.8.0 containing GitLab Runner 12.2.0.

Part of gitlab-org/gitlab-runner#4576 (closed)

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