Issue #3278176: Drupal.org Gitlab CI support

.drupalci/.gitlab-single-pipeline.yml

+default:
+  image: skpr/php-cli:${PHP_VERSION}-dev-v2-latest
+  services:
+    - name: mysql:${MYSQL_VERSION}
+      alias: mysql
+
+stages:
+  - pre
+  - build
+  - lint
+  - test
+
+variables:
+  # Configure mysql environment variables (https://hub.docker.com/_/mysql/)
+  MYSQL_ROOT_PASSWORD: drupal
+  MYSQL_DATABASE: drupal
+  MYSQL_USER: drupal
+  MYSQL_PASSWORD: drupal
+  SIMPLETEST_DB: mysql://drupal:drupal@mysql/drupal
+  SIMPLETEST_BASE_URL: http://localhost:8080
+  BROWSERTEST_OUTPUT_DIRECTORY: app/sites/default/files
+  BROWSERTEST_OUTPUT_FILE: test-output.html
+  MINK_DRIVER_ARGS_WEBDRIVER: '["chrome", {"chromeOptions": { "args": [ "--disable-gpu", "--headless" ] } }, "http://chrome:4444/wd/hub" ]'
+
+build app:
+  stage: build
+  cache:
+    key: ${CI_COMMIT_REF_SLUG}-composer
+    paths:
+      - app/vendor/
+  only:
+    - merge_requests
+    - branches
+    - tags
+  script:
+    - mkdir -p /tmp/project
+    - cp -r ${CI_PROJECT_DIR} /tmp/project/
+    - git clone --depth 1 --branch ${DRUPAL_CORE_CONSTRAINT}.x https://git.drupal.org/project/drupal.git app
+    - mv /tmp/project app/modules/
+    - cd app
+    - cp modules/project/hux/.drupalci/* .
+    - composer install
+    - composer config --no-plugins allow-plugins.dealerdirect/phpcodesniffer-composer-installer true
+    - composer config --no-plugins allow-plugins.cweagans/composer-patches true
+    - composer config --no-plugins extra.patches-file "composer.patches.json"
+    - composer config --no-plugins extra.enable-patching true
+    - composer config --unset platform.php
+    - composer require
+      --with-all-dependencies
+      dealerdirect/phpcodesniffer-composer-installer
+      dpi/drupal-phpunit-bootstrap
+      drupal/core-dev:^${DRUPAL_CORE_CONSTRAINT}
+      phpspec/prophecy-phpunit:^2
+      mglaman/phpstan-drupal:^1
+      phpstan/phpstan-deprecation-rules:*
+      micheh/phpcs-gitlab
+    - composer require -W cweagans/composer-patches
+    - composer require -W drupal/coder 8.3.x-dev#9fc079a2657f3780c8efb6f55baf995dea63b8c1
+    - composer require
+      drupal/dynamic_entity_reference:'^1@dev || ^3@dev'
+      drush/drush
+    - composer show
+    - mkdir -p ${BROWSERTEST_OUTPUT_DIRECTORY}
+  artifacts:
+    expire_in: 1 hour
+    paths:
+      - app/composer.lock
+      - app/
+
+phpcs:
+  stage: lint
+  needs: ["build app"]
+  only:
+    - merge_requests
+    - branches
+    - tags
+  script:
+    - cd app
+    - vendor/bin/phpcs --standard=modules/project/hux/phpcs.xml --report=full --report-\\Micheh\\PhpCodeSniffer\\Report\\Gitlab=phpcs-quality-report.json modules/project/hux/
+  dependencies:
+    - build app
+  artifacts:
+    when: always
+    reports:
+      codequality: app/phpcs-quality-report.json
+
+phpstan:
+  stage: lint
+  needs: ["build app"]
+  only:
+    - merge_requests
+    - branches
+    - tags
+  script:
+    - cd app
+    - vendor/bin/phpstan analyse --memory-limit=2G --no-progress -c phpstan.neon modules/project/hux --error-format gitlab > report.json
+  dependencies:
+    - build app
+  artifacts:
+    when: always
+    reports:
+      codequality: app/report.json
+
+test unit:
+  needs: ["build app"]
+  stage: test
+  only:
+    - merge_requests
+    - branches
+    - tags
+  script:
+    - cd app
+    - vendor/bin/phpunit modules/project/hux/tests/src/Unit/ --log-junit report-unit.xml
+  dependencies:
+    - build app
+  artifacts:
+    when: always
+    reports:
+      junit: app/report-unit.xml
+
+test kernel:
+  needs: ["build app"]
+  stage: test
+  before_script:
+    - cd app
+    - ./wait-for-it.sh -s -t 180 mysql:3306 -- echo "MySQL is Ready"
+  only:
+    - merge_requests
+    - branches
+    - tags
+  script:
+    - vendor/bin/phpunit modules/project/hux/tests/src/Kernel/ --log-junit report-kernel.xml
+  dependencies:
+    - build app
+  artifacts:
+    when: always
+    reports:
+      junit: app/report-kernel.xml