Tests fail in pipelines

I've been setting up my current laravel 8 project with a pipeline to run tests on bitbucket before publishing to my live server.

My application is able to migrate and seed data ok but when I run the php artisan test step I get failures for the feature tests.

A typical feature test looks like:

    /** @test */
    public function gets_list_of_activities(): void
    {
        $response = $this->get('/api/v1/activities');

        $response
            ->assertSuccessful();
    }

and the failure message is

 SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known 

and full bitbucket pipeline

image: php:7.4-fpm

pipelines:
  branches:
    '{develop,feature/*}':
      - step:
          name: Run tests and deploy to dev
          deployment: test
          caches:
            - composer
          services:
            - mysql
          artifacts: # defining the artifacts to be passed to each future step.
            - storage/logs/*.log
            - reports/*.txt
          after-script:
            - find /opt/atlassian/pipelines/agent/build/ -name *laravel*.log
          script:
            - echo "master, dev, or feature/*"
            - mkdir /usr/share/man/man1/
            - apt-get update && apt-get install -qy git zip curl libmcrypt-dev default-mysql-client libxml2-dev default-jre wget maven
           # - yes | pecl install mcrypt-1.0.1
            - docker-php-ext-install pdo_mysql bcmath
            - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
            - composer install
            - ln -f -s .env.pipelines .env
            - php artisan optimize:clear
            - php artisan migrate:fresh
            - php artisan db:seed
            - php artisan serve &
            - sleep 5
            - php artisan test
definitions:
  services:
    mysql:
      image: mysql:5.7
      command: --max_allowed_packet=100M
      environment:
        MYSQL_DATABASE: 'homestead'
        MYSQL_RANDOM_ROOT_PASSWORD: 'yes'
        MYSQL_USER: 'homestead'
        MYSQL_PASSWORD: 'secret'

Does anyone know what I should do with DNS so phpunit can access the application?