The generated gcp name had an invalid `.tar.gz` extension. This
extension still needs to be supplied for the object name however.
The integration tests supply the image name rather than relying in the
generated one, which is why this slipped through.
If an osbuild or koji-osbuild job has failed, add
a check to see if it is a result of the build jobs
dependencies and return the dependency failure job
error furthest up the chain of errors & add this
error to the details filed of the build job error.
I think it's a natural fit, they access some fields from the server so let's
find a new home for them there.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>
