As a Plugin admin I want to be able to stage rollouts throughout my Cluster fleet:
e.g. validate updates in bronze region, if healthy promote to silver and finally to gold

Description

With this spike we want to find out if there is a good way to configure renovate to (auto-) promote updates to different regions by maintaining separate Catalogs (e.g. bronze, silver, gold).

Revisit the draft PR linked to this issue. It might be outdated but holds valid thoughts that need confirmation.

The idea would be:

• bronze Catalog tracks main branch
• silver Catalog automerges renovate updates for a PluginDefinition (via tag/sha) after x days of PD update
• gold Catalog automerges renovate updates for a PD after x+y days of PD update