Add the information about osbuid artifact to the target result.
Specifically the name of the osbuild pipeline which was exported for the
specific target, and the filename of the exported file.
This will later enable embedding this information in Koji build metadata
to make it easy to reproduce the image build using the attached
manifest.
Worker
------
Add configuration for the default container registry.
Use the default container registry if not provided as part
of the image name.
When using the default registry use the configured values
Return the image url as part of the result.
Composer Worker API
-------------------
Add `ContainerTargetResultOptions` to return the image url
Composer API
------------
Add UploadOptions to allow setting of the image name and tag
Add UploadStatus to return the url of the uploaded image
Co-Developed-By: Christian Kellner <christian@kellner.me>
The filename of the image as produced by osbuild for a given export is
currently set in each target options type in the `Filename` struct
member. However, the value is not really specific to any target type,
but to the specific export used for the target. For this reason move the
value form target type options to the `Target` struct inside a new
struct `OsbuildArtifact` under the name`ExportFilename`.
The backward compatibility with older implementations of the composer
and workers is kept on the JSON (Un)mashaling level, where the JSON
object is always a super-set of the old and new way of providing the
export filename in the Target.
Ensure that `UnmarshalTargetResultOptions()` is called only when there
are any options to unmarshal in the JSON object.
Since results of some Targets don't have any options defined, mark
`TargetResult.Options` as optional in the JSON tag.
Add a new generic container registry client via a new `container`
package. Use this to create a command line utility as well as a
new upload target for container registries.
The code uses the github.com/containers/* project and packages to
interact with container registires that is also used by skopeo,
podman et al. One if the dependencies is `proglottis/gpgme` that
is using cgo to bind libgpgme, so we have to add the corresponding
devel package to the BuildRequires as well as installing it on CI.
Checks will follow later via an integration test.
