Determine tag name for auto-deploy for Helm and CNG

After the discussion held in the meeting today for #685 (closed), we've determined to move forward without blocking the auto-deploy enablement for our helm charts, that we can use a smaller tag to minimize confusion of interpretation of other projects. So what do we tag with?

Current tag

• 12.9.202002191723+d42c6afcade.d99b3393e62 == <MAJOR>.<MINOR>.<TIMESTAMP>+<GitLab sha>.<omnibus sha>

Proposal

• Helm and CNG will receive the same tag, regardless of major, minor, or the commit for which we are tagging
• 12.9.202002191723+d42c6afcade.auto-deploy == <MAJOR>.<MINOR>.<TIMESTAMP>+<GitLab sha>.auto-deploy
• 12.9.202002191723+d42c6afcade == <MAJOR>.<MINOR>.<TIMESTAMP>+<GitLab sha>

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Utilize this issue to discuss any issues with this tag name. After we all agree, this will allow us to move forward with:

• #577 (closed) <- work to complete the CNG tag
• #623 (closed) <- tag helm chart

/cc @gitlab-org/delivery