release: Add guardrails for mixing releases
release: Add guardrails for mixing releases

As a sanity check, make sure that the cilium source directory that is
being used to generate the release specifies the same version as the one
being specified on the uploadrev commandline.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@cilium.io>

tgraf/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,cilium-team/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,cilium/cilium,cilium-team/cilium,michi-covalent/cilium