This commit updates the check_install_docker.sh script used in the Jenkins installers. It modifies the installation command for kubectl to use the updated URL: https://dl.k8s.io/release/$(curl -sL https://dl.k8s.io/release/stable.txt)/bin/linux/${ARCH}/kubectl. This ensures that the latest version of kubectl is downloaded and installed during the Jenkins installation process.
The previous URL https://storage.googleapis.com/kubernetes-release/release/stable.txt is being moved.
Signed-off-by: Ricky Sadowski <richard.j.sadowski@gmail.com>