Uploads an artifact to an S£ bucket and returns a presigned URL to allow
the user to download the file.
Although it uses a lot of common code with the AWS AMI upload target,
it's treated as a completely separate target.
Add the TargetResult struct to OSBuildJobResult. Include the 'options'
interface on TargetResult to contain target-specific information,
for example amiID and region from AWS. Expose 'options' on a status
call as an UploadStatus field. Add logic to support AWS within this
format, which can be used as a template for other targets.
Rather than having to assume that we only ever produce one
artifact, have each upload target contain the filename it expects
to upload from the osbuild output.
An image file is always explicitly named in the manifest, and we
leave it up to each distro to decide how this is done, but the
convention is to use the same image filename as used when
downloading the image through weldr.
Now make this policy explicit, by quering the distro for the image
name and inserting it into each upload target.
Signed-off-by: Tom Gundersen <teg@jklm.no>
