build: use a single compose file with `.env` file (#3242)
* build: use a single compose file with .env file
* chore: add .env.debug configuration
* ci: update github actions to use docker-compose.yml
* chore: remove context path from compose file
* chore: fix nginx volume path
* chore: add .env.debug
* chore: remove remaining MONGO_PORT default from compose file