Before enabling bitbucket pipeline, Create bitbucket-pipelines.yml in main folder

# This is a sample build configuration for PHP.
# Check our guides at https://confluence.atlassian.com/x/e8YWN for more examples.
# Only use spaces to indent your .yml configuration.
# -----
# You can specify a custom docker image from Docker Hub as your build environment.
image: lorisleiva/laravel-docker

pipelines:
  branches:
    master:
      - step:
          caches:
            - composer
          script:
            - apt-get update && apt-get install -y unzip
            - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
            - composer install --prefer-dist --no-ansi --no-interaction --no-progress --no-scripts
            - cp .env.example .env
            - php artisan key:generate
            - php artisan config:clear
            - php artisan migrate
            - vendor/bin/phpunit
          services:
            - mysql
definitions:
  services:
    mysql:
      image: mysql:5.7
      variables:
        MYSQL_DATABASE: 'homestead'
        MYSQL_RANDOM_ROOT_PASSWORD: 'yes'
        MYSQL_USER: 'homestead'
        MYSQL_PASSWORD: 'secret'

Then enable the pipeline in the repository