How can I run multiple instances on the same virtual machine

I'm trying to setup a separate testing, production and stage appwrite project on the same so that when developing the tests can run in isolation from the stage. To allow smooth setup and teardown of the testing environment. I found it wise to have three environments run in isolation that is the production, staging and testing environments. I'm facing challenges because I'm novice in docker and I'm setting all of these environments on my local machine so that I can simulate the workflow better. Therefore I need some guidance on how I can create multiple instances on the server (vm) for these environments to exist.

I've sofar created separate files for the necessary env variables i.e .env.development.local, .env.production.local and .env.testing.local and two different docker compose yaml files i.e docker-compose.dev.yml and docker-compose.test.yml. I've tried running them but get an error as bad gateway. Attached are the two docker-compose files. Any help is welcome.

Those are the docker files