Continuous Integration - Laravel GitLab on Heroku

gitlab-ci.yml

image: lorisleiva/laravel-docker:latest

phpunit:
  stage: test
  script:
    - composer install --prefer-dist --no-ansi --no-interaction --no-progress --no-scripts
    - cp .env.example .env
    - php artisan key:generate
    - phpunit --colors=never
        
production:
  stage: deploy
  variables:
    HEROKU_API_KEY: $HEROKU_PRODUCTION_API_KEY
  script:
    - apk add ruby ruby-dev ruby-irb ruby-rake ruby-io-console ruby-bigdecimal ruby-json ruby-bundler yarn ruby-rdoc >> /dev/null
    - apk update
    - gem install dpl >> /dev/null
    - dpl --provider=heroku --app=sr2ds-mercado-livre --api-key=$HEROKU_API_KEY
    - yarn global add heroku@$HEROKU_CLI_VERSION
    - heroku run php artisan migrate --seed --force --exit-code --app sr2ds-mercado-livre
    - heroku run php artisan cache:clear --exit-code --app sr2ds-mercado-livre
    - heroku run php artisan ml:anuncio --exit-code --app sr2ds-mercado-livre

maybe wrong in your heroku api key