This commit adds support to upload the build image directly to
the target cloud. Currently only ami/AWS is supported.
If the cloud specific configuration is given at the commandline
and the image type is a cloud image the cloud upload will happen
automatically (just like with bib). Incomplete upload config is
an error.
Supply initial documentation for `image-builder`. This documentation
will be imported into the osbuild [1] website.
[1]: https://osbuild.org/
Signed-off-by: Simon de Vlieger <supakeen@redhat.com>
