Added explicit configuration option storage-redirect-disable

[Alex Ramanau]

Added charm configuration option `storage-redirect-disable` which allows to configure distribution behavior for s3/swift object storages.

We need to provide such an option because this charm could be deployed with private object storage(CEPH RADOS object storage) and in this case user can't download any artifacts from the registry with private S3 storage.

PR: https://github.com/canonical/docker-registry-charm/pull/71

[Alex Ramanau (drednout)]

Please note that proposed patch also contains the fix for the broken GH workflow.

[Adam Dyess (addyess)]

Thanks Alex for the contribution. We'll try to get this into 1.31+ck1 release if/when it comes up -- otherwise it will show up in the 1.32 stable release this fall.

if you need it urgently, let me know and I can cut a release or you can use 1.32/edge channel of this charm when it's built.

[Adam Dyess (addyess)]

rebased release_1.31 branch from main... adding these to the next 1.31/candidate