Add registry cache

[jesusbv]

Description

Add the cache for the registry

Change Type

Please select the correct option.

• [ ] Bug Fix (a non-breaking change which fixes an issue)
• [X] New Feature (a non-breaking change which adds new functionality)
• [ ] Documentation Update (a change which only updates documentation)

Checklist

Please check off each item if the requirement is met.

• [X] I have verified that my code follows RMT's coding standards with rubocop.
• [X] I have reviewed my own code and believe that it's ready for an external review.
• [X] I have provided comments for any hard-to-understand code.
• [ ] I have documented the MANUAL.md file with any changes to the user experience.
• [X] RMT's test coverage remains at 100%.
• [ ] If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

Other Notes

Please use this space to provide notes or thoughts to the team, such as tips on how to review/demo your changes.

[jesusbv]

First, merge #1140

[rjschwei]

If you build branches on top of each other and then send PRs to the origin branch then the reviewer sees the full diff to the origin branch. Meaning things need to get reviewed twice.

You either need to hold the updates that build on top of each other, or submit PRs into the branch that you are using as origin for the follow on work.

[jesusbv]

If you build branches on top of each other and then send PRs to the origin branch then the reviewer sees the full diff to the origin branch. Meaning things need to get reviewed twice.

You either need to hold the updates that build on top of each other, or submit PRs into the branch that you are using as origin for the follow on work.

OK, updated the origin branch of the subsequent PRs