Features
- Added support for pull-through caching. Users can now configure a dedicated distribution and remote
linked to an external registry without the need to create and mirror repositories in advance. Pulp
downloads missing content automatically if requested and acts as a caching proxy.
[507](https://github.com/pulp/pulp_container/issues/507)
Bugfixes
- Added `application/vnd.docker.distribution.manifest.v1+prettyjws` to the list of accepted
media types retrieved from a remote registry.
[1444](https://github.com/pulp/pulp_container/issues/1444)
Misc
- [489](https://github.com/pulp/pulp_container/issues/489), [#1275](https://github.com/pulp/pulp_container/issues/1275)
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