IssueTracker

As per the official documentation [1] currently the following are the only optional ways to define your delete policy:

Tag prefixes,Version prefixes,Package prefixes,Older than,Newer than.

It would be helpful if it's possible to create a cleanup policy in the following ways.

- Creating a cleanup policy with a sub string inside the tag, not at the beginning of the tag
- Creating a cleanup policy to add a regular expression in the tag prefix value

[1]: https://cloud.google.com/artifact-registry/docs/repositories/cleanup-policy#delete