Since flatpak_image_source_new_remote() already tries to load files
from the registry, having a separate flatpak_image_source_set_token()
doesn't work - when the token is set, it's already too late to
be passed along with the initial requests.
Instead of passing the delta URL along with the image source, when
we create an image source for a remote registry, if we find a delta
URL in the metadata, set it on the FlatpakImageSource for later use.
Centralize duplicated code for creating an image source for a remote
repository based on a summary lookup into one place.
Add support for `oci-archive:` image sources by temporarily
unpacking the archive using libarchive.
Co-authored-by: Sebastian Wick <sebastian.wick@redhat.com>
Which allows one to create an image source from a container location.
It also adds a new FlatpakDockerReference to access different parts of a
docker reference and changes to FlatpakOciIndex to get a manifest for a
specific architecture.
This will become useful in the next commit when we're going to add
support for installing OCI images.
To avoid passing around combinations of a FlaptakOciRegistry with
repository and digest, add a FlatpakImageSource type.
This also reduces duplicated code where every place that did
this independently retrieved the repository and image config.
