Backend of site on my local system is not available

after i cloned the forked repo of i ran the command "docker-compose up" after getting into "volto" and my project started after pulling required backend and frontend but backend is unavailable, not able to figure out why ?

note :- i did not ran "yarn install", because it was not mentioned in

shall i run "yarn install" before running "docker-compose up" ?

ok i tried doing that, and it worked, ran "yarn" before starting the application, and it worked, now i am able to use the application on my seamlessly.