Cloud Build example settings for a Laravel application

cloudbuild.yaml

steps:
- name: 'gcr.io/cloud-builders/gsutil'
  args:
    - cp
    - .env.testing
    - .env
- name: 'docker/compose:1.23.1'
  args:
    - run
    - app
    - composer
    - install
    - --optimize-autoloader
    - --no-interaction
    - --no-ansi
    - --no-progress
    - --no-scripts
    - --prefer-dist
- name: 'docker/compose:1.23.1'
  args:
    - run
    - app
    - vendor/bin/phpunit
    - --no-coverage
- name: 'gcr.io/cloud-builders/gsutil'
  args:
    - cp
    - ${_APP_YAML_CONFIG}
    - app.yaml
- name: 'gcr.io/cloud-builders/gcloud'
  args:
    - app
    - deploy
    - --no-promote
timeout: '600s'

Github actions is also an easy and free option to run your continuous integration workflow, example:

name: Tests

on: [ pull_request ]

jobs:
  tests:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Shutdown Databases
        run: |
          sudo service postgresql stop

      - name: Create .env
        run: cp .env.testing .env

      - name: Cache Composer packages
        id: composer-cache
        uses: actions/cache@v2
        with:
          path: vendor
          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
          restore-keys: |
            ${{ runner.os }}-php-

      - name: Install dependencies
        run: composer install --prefer-dist --no-progress

      - name: Run the containers
        run: |
          docker-compose -f docker-compose.ci.yml up -d app
          sleep 1

      - name: Run tests
        run: docker exec -t app php artisan test