.github/workflows: add step to verify helm-charts images versions
.github/workflows: add step to verify helm-charts images versions

As image versions are supposed to be set in the Makefile, we should add
a step on the GH workflow to verify the correctness of those versions.

Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

cilium/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium