The update payload needs the kernel, which isn't signed during the image
job. Secure Boot is not currently enabled for update tests, but we may
as well do this properly. The production update upload is generated
manually at the end after everything has already been signed.
Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>
We only want to do the signing in Azure, not the whole image job. This
new job downloads the unsigned image, signs it, and replaces it.
Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>
