Docker Laravel+Postgresql translation to hostname

I am approaching for the first time the Docker universe.

I have this 3 years old working Laravel App (5.2), connected to a Psotgresql db.

The asked some modifications and to bring it to an internal server of their own.

I cannot adapt it to a new Laravel version yet, so I thought it would have been a good idea to deploy in container the 5.2 app in case other people need to work on it.

So far, following some instructions, I ge to this point:

docker-compose.yml:

version: '3'

networks:
    laravel:
        driver: bridge

services:

nginx:
    image: nginx:stable-alpine
    container_name: nginx
    ports:
        - "8080:80"
    volumes:
        - ./src:/var/www/html
        - ./nginx/default.conf:/etc/nginx/conf.d/default.conf
    depends_on: 
        - php
        - psql
    networks:
        - laravel

psql:
    image: postgres:12.7-alpine
    container_name: postgresql
    environment:
        - POSTGRES_HOST_AUTH_METHOD=trust
        - POSTGRES_USER=xxxx
        - POSTGRES_PASSWORD=yyyy
        - POSTGRES_DB=zcreport_ecostarfinal_new
    restart: always
    tty: true
    ports: 
        - "5433:5432"
    volumes:
        - './postgresql:/var/lib/postgresql/data'
    networks:
        - laravel

php:
    build:
        context: ./php
        dockerfile: Dockerfile
    container_name: php
    volumes:
        - ./src:/var/www/html
    ports:
        - "9000:9000"
    networks:
        - laravel

I have the /postgresql folder with (I hope) the data I copied from my local /var/lib/postgresql/12/main folder I have the /src folder whre i put my laravel app

And this is the .env inside /src folder:

DB_CONNECTION=pgsql
DB_HOST=postgresql
DB_PORT=5432
DB_DATABASE=zcreport_ecostarfinal_new
DB_USERNAME=xxxx
DB_PASSWORD=yyyy

Now, when I build and run the docker-compose and check the localhost the site loads but I get a 500 error:

PDOException in Connector.php line 55: SQLSTATE[08006] [7] could not translate host name "psql" to address: Temporary failure in name resolution

I don't know how to solve this problem

Thanks