kubectl from isv:kubernetes:core:stable:v1.28:build project

For rpm run the following as root:

zypper addrepo https://download.opensuse.org/repositories/isv:kubernetes:core:stable:v1.28:build/rpm/isv:kubernetes:core:stable:v1.28:build.repo
zypper refresh
zypper install kubectl

For deb run the following:

Keep in mind that the owner of the key may distribute updates, packages and repositories that your system will trust (more information).

echo 'deb http://download.opensuse.org/repositories/isv:/kubernetes:/core:/stable:/v1.28:/build/deb/ /' | sudo tee /etc/apt/sources.list.d/isv:kubernetes:core:stable:v1.28:build.list
curl -fsSL https://download.opensuse.org/repositories/isv:kubernetes:core:stable:v1.28:build/deb/Release.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/isv_kubernetes_core_stable_v1.28_build.gpg > /dev/null
sudo apt update
sudo apt install kubectl