Composer with docker-compose php interpreter

Hello

Please tell me how can i install composer with docker-compose and Dockerfile?

I am trying to use project on my local machine without installing anything, use only docker services. I want to install composer that way i will able to use it after setting my docker-compose php interpreter (with this no problems, PDO working and localhost show me data from php files ) and set for composer CLI interpreter php from docker--compose. So after that if i open composer.json in app folder it will execute any composer command with composer installed via docker compose

Thanks in advance