Implement global configuration for Gitaly

Jason Plumrequested to merge
442-implement-global-gitaly-settings into master

Implement global configuration for Gitaly

  • Introduce tempaltes for gitlab.gitaly.*
  • Alter gitaly chart to coalesce the global for authToken.*
  • Gate gitaly-secret creation on global.gitaly.authToken.secret
  • Changelog item added

Closes #442 (closed)

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