Access option from config.json for my own custom addon

I’m writing custom add-on and want to access config.json data inside run.sh. Right now options looks like this: "db_name":null, I want to configure db_name in addon configuration and use its value inside run.sh. But I’m unable to find where config.json is located inside addon Dockerfile, or where options is locate

Here is my repo: GitHub - AndreyPushkinA/clickhouse-client-addon: This repository contains PostgreSQL to Clickhouse migration as Home Assistant addon.