[release-1.24] Remove deprecated nodeSelector label beta.kubernetes.io/os

[caroline-suse-rancher]

Problem:
The nodeSelector label beta.kubernetes.io/os in the CoreDNS deployment was deprecated in 1.14 and will likely be removed soon

Solution:
Change the nodeSelector to remove the beta

Backport for issue #6970

[VestigeJ]

Reproduced using VERSION=v1.24.12+k3s1
Validated change using COMMIT=a6bd15fb71fb768416aefc17a9472b09fd1649af

Infrastructure

• Cloud

Node(s) CPU architecture, OS, and version:

Linux 5.14.21-150400.24.11-default x86_64 GNU/Linux 
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP4"

Cluster Configuration:

NAME               STATUS   ROLES                       AGE     VERSION
ip-1-1-1-13        Ready    control-plane,etcd,master   2m29s   v1.24.12+k3s-a6bd15fb 

Config.yaml:

N/A

v1.24.12+k3s1

$ curl https://get.k3s.io --output install-"k3s".sh
$ sudo chmod +x install-"k3s".sh
$ sudo groupadd --system etcd && sudo useradd -s /sbin/nologin --system -g etcd etcd
$ sudo modprobe ip_vs_rr
$ sudo modprobe ip_vs_wrr
$ sudo modprobe ip_vs_sh
$ sudo printf "on_oovm.panic_on_oom=0 \nvm.overcommit_memory=1 \nkernel.panic=10 \nkernel.panic_ps=1 \nkernel.panic_on_oops=1 \n" > ~/90-kubelet.conf
$ sudo cp 90-kubelet.conf /etc/sysctl.d/
$ sudo systemctl restart systemd-sysctl
$ sudo INSTALL_K3S_VERSION=v1.24.12+k3s1 INSTALL_K3S_EXEC=server ./install-k3s.sh 
$ set_kubefig //set KUBECONFIG=/etc/rancher/k3s/k3s.yaml
$ kgp -A //get all pods to find coredns pod name
$ kg po coredns-7b5bbc6644-hv5rk -n kube-system -o yaml | grep -i "beta"

Results:

$ k3s -v

k3s version v1.24.12+k3s1 (57e8adb5)
go version go1.19.7

$ kg po coredns-7b5bbc6644-hv5rk -n kube-system -o yaml | grep -i "beta"

    beta.kubernetes.io/os: linux

Validated changed label for CoreDNS pod using COMMIT=a6bd15fb71fb768416aefc17a9472b09fd1649af

Validation Steps

Upgrade existing single node to latest commit on branch.

$ sudo INSTALL_K3S_COMMIT=a6bd15fb71fb768416aefc17a9472b09fd1649af INSTALL_K3S_EXEC=server ./install-k3s.sh 
$ set_kubefig //set KUBECONFIG=/etc/rancher/k3s/k3s.yaml
$ kg po -n kube-system 
$ kg po coredns-74448699cf-vfps8 -n kube-system -o yaml | grep -i "kubernetes.io/os:"
$ k3s -v
$ get_report //generate this template

Results:

$ k3s -v

k3s version v1.24.12+k3s-a6bd15fb (a6bd15fb)
go version go1.19.7

$ kg po coredns-74448699cf-vfps8 -n kube-system -o yaml | grep -i "kubernetes.io/os:"

    kubernetes.io/os: linux

Additional context / logs: