Remove release instance deployment trigger from Ubuntu-20.04-staging job

Harsha Muralidharrequested to merge
hm-remove-release-trigger-from-omnibus into master

This MR restricts the Ubuntu-20.04-staging job to deploy only on RC tags while continuing to upload packages for both RC and release tags. This prevents deployment to the deprecated release.gitlab.com for final release tags while maintaining the package upload functionality.

Relates to gitlab-com/gl-infra/delivery#21084 (closed)

Edited by Harsha Muralidhar

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