Create action to cleanup old tags in Docker Hub

[FabioPinheiro]

Background

• We need to create a job/action to cleanup old tags (sha-***) from Docker Hub.
• We are creating a tag for each commit in main (and any manual job) and pushing to Docker Hub for testing purpose.
• So we should start considering cleaning up those tags after a month or something.
• https://hub.docker.com/repository/docker/hyperledgeridentus/identus-mediator/tags
• Please do not consider not submitting those tags in the first place. This is a great flow. Because this allows for: Testing; For people to have access to pre-release with hotfixe if needed; To test specific branches/commits with experimental features.

DoD

• Docker image tags older than 2 weeks should be deleted via a cron job

How to Test

• A couple of manual checks on the Docker list a week apart is sufficient to validate the cron job
• Cron job logs can also be checked

[pparker]

@FabioPinheiro & @amagyar-iohk say: R4D!