Use apt-get commands

Installation Home Assistant OS
5

In fact you can install packages in home assistant OS. The package manager uses the command apk add xxxx

First create bash script and make executable and put it in a shell command

shell_command: 
setup: /config/scripts/setup.sh

# setup. sh

#!/bin/sh
apk update
apk add -u busybox
apk add busybox-extras
apk add expect
apk add sshpass

Then create an automation that runs your shell command during startup

- id: hass_1
  initial_state: 'true'
  alias: System Startup Notification
  trigger:
    platform: homeassistant
    event: start
  action:
  - service: shell_command.setup