Create systemd unit to create rke user

files/rke_setup/usr/lib/systemd/system/create_rke_user.service

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+[Unit]
+Description=Create 'rke' user and add to docker group
+After=network.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/libexec/rke2/create-rke-user.sh
+RemainAfterExit=yes
+
+# Disable and mask the service after successful execution
+ExecStartPost=-/bin/systemctl disable --now create-rke-user.service
+ExecStartPost=-/bin/systemctl mask --now create-rke-user.service
+
+[Install]
+WantedBy=multi-user.target
+

files/rke_setup/usr/libexec/rke2/create_rke_user.sh

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+#!/bin/bash
+
+# Check if user 'rke' exists
+if ! id -u rke &> /dev/null; then
+    echo "Creating user 'rke'"
+    # Create user 'rke' with home directory using useradd
+    sudo useradd --system -m rke
+fi
+
+# Add 'rke' to docker group
+echo "Adding 'rke' to docker group"
+sudo usermod -aG docker rke
+
+echo "Done"
+exit 0