cosalib/kubevirt: add the version=buildID label to the kubevirt ociar…

…chive

Downstream RHCOS tooling uses this and it's probably a good idea to have
it anyway.

src/cosalib/kubevirt.py

@@ -37,6 +37,7 @@ def write_oci(self, _):
                 '-chardev', f'file,id=ociarchiveout,path={final_img}',
                 '-device', 'virtserialport,chardev=ociarchiveout,name=ociarchiveout',
                 '--', 'podman', 'build', '--disable-compression=false',
+                '--label', f'version={self.build_id}',
                 '--tag=oci-archive:/dev/virtio-ports/ociarchiveout', ctxdir])