Issue #3301466 by Berdir: Restore drupalci.yml and explicitly suppress deprecations

build:

  assessment:

    validate_codebase:

      phplint:

      container_composer:

      csslint:

      eslint:

      phpcs:

    testing:

      run_tests.standard:

        types: 'Simpletest,PHPUnit-Unit,PHPUnit-Kernel,PHPUnit-Functional'

        # Test for Drupal 9 compatibility

        suppress-deprecations: true

      run_tests.js:

        concurrency: 1

        types: 'PHPUnit-FunctionalJavascript'

        # Test for Drupal 9 compatibility

        suppress-deprecations: true

      nightwatchjs: