SSH script to manage manager users on remote host: create user, add public key

adduser.sh

set -euo pipefail

DEV_GROUP="somegroup"
sudo groupadd --force "${DEV_GROUP}"

function adduser() {
    local var_user="$1"
    shift 
    local var_ssh_pub_key="$*"
    id --user "${var_user}" &>/dev/null || sudo useradd --gid "${DEV_GROUP}" --groups wheel,docker "${var_user}"
    echo "${var_user} ALL=(ALL) NOPASSWD:ALL" | sudo tee "/etc/sudoers.d/${var_user}"
    sudo --user "${var_user}" mkdir -p "/home/${var_user}/.ssh"
    sudo --user "${var_user}" touch "/home/${var_user}/.ssh/authorized_keys"
    echo "${var_ssh_pub_key}" | sudo --user "${var_user}" tee "/home/${var_user}/.ssh/authorized_keys"
}

adduser someuser ssh-rsa AAAAB3NzaC1.... user@host