How to start a simple script in a sandbox when Home-Assistant starts

Configuration
1

I have a background script that needs to run when Homeassistant starts.

It have no communication with Home Assistant, but it configures a number of things, that I need for a custom component.

So quite simple, I start Homeassistant, Homeassistant starts the script and forget it.

Please, how to configure in Home Assistant and how to configure in .yaml file.

2

If you’re creating a custom integration, then why not have it invoke the script, kind of like shell_command can run an external command? E.g., take a look at the following as a reference:

https://github.com/home-assistant/core/blob/c8d49a8adfd6a4587b79f2361ec7d59ffdc575e4/homeassistant/components/shell_command/__init__.py