Add glibc version constraints to the kubelet package

[saschagrunert]

kubernetes/kubernetes#118996 (#3076) will land in Kubernetes 1.29, containing a switch to debian:bookworm. This means we now require glibc 2.36 (compared to 2.31 on bullseye) for non static binaries like the kubelet.

The package of the kubelet could contain a constraint like this to highlight possible incompatibilities:

Requires: glibc >= 2.36

This needs to be done per release branch, while only affecting 1.29. We could also add a similar constraint to previous release branches (with 2.31).

cc @kubernetes/release-managers

[cpanato]

We might upgrade the active branches to 1.21 as well so if that happens we need that constrain in the others as well

[saschagrunert]

We'll bump back to bullseye with #3249, means we can add the 2.31 glibc constraint to all maintained release branches.

[dweineha]

Current Ubuntu LTS (22.04) uses 2.35 (and the next version won't release until 5 months after Kubernetes 1.29). Am I understanding things correctly that Kubernetes 1.29 won't be usable on Ubuntu 22.04 LTS?

[saschagrunert]

Current Ubuntu LTS (22.04) uses 2.35 (and the next version won't release until 5 months after Kubernetes 1.29). Am I understanding things correctly that Kubernetes 1.29 won't be usable on Ubuntu 22.04 LTS?

No, we still support the previous glibc version from bullseye per https://github.com/kubernetes/kubernetes/blob/master/build/build-image/cross/VERSION