GitLab CI (version >= 9) configuration for testing and TER uploading TYPO3 extensions

.gitlab-ci.yml

cache:
  key: "$CI_COMMIT_REF_NAME/$CI_JOB_STAGE"
  paths:
    - .composer/

before_script:
  # Install git on machine
  - apk add git --update

stages:
  - test
  - mirror
  - upload

.test: &testing
  stage: test
  image: php:$DOCKER_TAG
  only:
    - branches
  before_script:
    # Where to locate the DocRoot (needed for Unit Tests)
    - export TYPO3_PATH_WEB="$PWD/.Build/Web"
    - export COMPOSER_CACHE_DIR=.composer
    # Install composer
    - curl -OLs https://composer.github.io/installer.sig
    - php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
    - php -r "if (hash_file('SHA384', 'composer-setup.php') === trim(file_get_contents('installer.sig'))) { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
    - php composer-setup.php --no-ansi --install-dir=/usr/bin --filename=composer
    - php -r "unlink('composer-setup.php'); unlink('installer.sig');"
    # Get the given TYPO3 core
    - composer require typo3/cms="${TYPO3_VERSION}" --update-with-dependencies
    # Get the TYPO3 testing framework (thx to Nicole and Helmut for that)
    - composer require nimut/testing-framework
    # Get the latest PHP_CodeSniffer
    - composer require squizlabs/php_codesniffer
  script:
    # Run Unit Tests
    - .Build/bin/phpunit -c Configuration/.Build/Tests/UnitTests.xml
    # Run PHP_CodeSniffer (warning_severity is needed due usage of hooks which are not psr2 compliant)
    - .Build/bin/phpcs --standard=PSR2 --config-set warning_severity 8 Classes Configuration/TCA Tests/Unit

# Tests in PHP 5.6 and TYPO3 6.2
test:php56:typo3_62:
  <<: *testing
  variables:
    DOCKER_TAG: 5.6-alpine
    TYPO3_VERSION: ^6.2

# Build in PHP 5.6 and TYPO3 7.6
test:php56:typo3_7:
  <<: *testing
  variables:
    DOCKER_TAG: 5.6-alpine
    TYPO3_VERSION: ^7.6

# Build in PHP 7.0 and TYPO3 7.6
test:php70:typo3_7:
  <<: *testing
  variables:
    DOCKER_TAG: 7.0-alpine
    TYPO3_VERSION: ^7.6

# Build in PHP 7.1 and TYPO3 7.6
test:php71:typo3_7:
  <<: *testing
  variables:
    DOCKER_TAG: 7.1-alpine
    TYPO3_VERSION: ^7.6

# Build in PHP 7.0 and TYPO3 8 (latest stable release)
test:php70:typo3_8:
  <<: *testing
  variables:
    DOCKER_TAG: 7.0-alpine
    TYPO3_VERSION: ^8

# Build in PHP 7.1 and TYPO3 8 (latest stable release)
test:php71:typo3_8:
  <<: *testing
  variables:
    DOCKER_TAG: 7.1-alpine
    TYPO3_VERSION: ^8

# Build in PHP 7.0 and TYPO3 (current master)
test:php70:typo3_master:
  <<: *testing
  variables:
    DOCKER_TAG: 7.0-alpine
    TYPO3_VERSION: dev-master

# Build in PHP 7.1 and TYPO3 (current master)
test:php71:typo3_master:
  <<: *testing
  variables:
    DOCKER_TAG: 7.1-alpine
    TYPO3_VERSION: dev-master

mirror-to-github:
  stage: mirror
  image: indiehosters/git
  only:
    - master
  script:
    - git remote add github https://$GITHUB_USERNAME:$GITHUB_TOKEN@github.com/$GITHUB_USERNAME/$GITHUB_REMOTE_REPO_NAME.git
    - git push github master
    - git push github master --tags

# TER Upload when tagging in master branch
# The variables T3O_USERNAME and T3O_PASSWORD should be set in GitLab
ter-upload:
  image: php:7-alpine
  stage: upload
  only:
    - tags
  before_script:
    - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
    - export COMPOSER_CACHE_DIR=.composer
  script:
    - composer install
    # Get the package for uploading to TER (thx to Claus)
    - composer require namelesscoder/typo3-repository-client
    - export TYPO3_PATH_WEB="$PWD/.Build/Web"
    # Upload to TER if a Git tag was set (and username/password is set in the global variables)
    - >
      if [ -n "$CI_COMMIT_TAG" ] && [ -n "$T3O_USERNAME" ] && [ -n "$T3O_PASSWORD" ]; then
        echo -e "Preparing upload of release ${CI_COMMIT_TAG} to TER\n"
        # Cleanup before we upload
        git reset --hard HEAD && git clean -fx
        # Upload
        TAG_MESSAGE=`git tag -n10 -l $CI_COMMIT_TAG | sed 's/^[0-9.]*[ ]*//g'`
        echo "Uploading release ${CI_COMMIT_TAG} to TER"
        .Build/bin/upload . "$T3O_USERNAME" "$T3O_PASSWORD" "$TAG_MESSAGE"
      fi;

composer.json

{
  "name": "vendorname/extensionname",
  "type": "typo3-cms-extension",
  "description": "Description of my extension",
  "homepage": "https://typo3.org",
  "license": [
    "GPL-2.0+"
  ],
  "keywords": [
    "TYPO3",
    "extension"
  ],
  "authors": [
    {
      "name": "Thomas Löffler",
      "email": "loeffler@spooner-web.de",
      "homepage": "https://spooner-web.de",
      "role": "Developer"
    }
  ],
  "require": {
    "typo3/cms": "^6.2 || ^7 || ^8"
  },
  "autoload": {
    "psr-4": {
      "VendorName\\ExtensionName\\": "Classes/"
    }
  },
  "config": {
    "vendor-dir": ".Build/vendor/",
    "bin-dir": ".Build/bin/"
  },
  "extra": {
    "typo3/cms": {
      "cms-package-dir": "{$vendor-dir}/typo3/cms",
      "web-dir": ".Build/Web"
    }
  }
}

gitlab-runner.toml

concurrent = 5

[[runners]]
  name = "GitLab Runner"
  url = "https://my.gitlab.com/ci"
  token = "xxx"
  envorionment = ["COMPOSER_CACHE_DIR=/cache"]
  executor = "docker"
  [runners.docker]
    tls_verify = false
    image = "webdevops/php"
    privileged = false
    disable_cache = false
    volumes = ["/var/cache:/cache:rw"]
    cache_dir = "/cache"
  [runners.cache]
    Insecure = false

UnitTests.xml

<phpunit
        backupGlobals="true"
        backupStaticAttributes="false"
        bootstrap="../../../.Build/vendor/nimut/testing-framework/src/TestingFramework/Bootstrap/UnitTestsBootstrap.php"
        colors="true"
        convertErrorsToExceptions="true"
        convertWarningsToExceptions="true"
        forceCoversAnnotation="false"
        processIsolation="false"
        stopOnError="false"
        stopOnFailure="false"
        stopOnIncomplete="false"
        stopOnSkipped="false"
        verbose="false"
>
    <testsuites>
        <testsuite name="Base tests">
            <directory>../../../Tests/Unit</directory>
        </testsuite>
    </testsuites>
</phpunit>

One Idea:
Use a cache key for all tests to share the composer cache across all dependent jobs
e.g.:

cache:
  key: "$CI_BUILD_STAGE"
  paths:
  - .composer/

Use variables instead of script/export because they are merged from global to job e.g.:

variables:
  COMPOSER_CACHE_DIR: ".composer"
  COMPOSER_ALLOW_SUPERUSER: "1"
  TYPO3_VERSION: ^7.6
  TYPO3_PATH_WEB: "$CI_PROJECT_DIR/.Build/Web"

test:php7.1:typo3_85:
  variables:
    TYPO3_VERSION: ^8.5

One job to check outdated composer packages can also be helpful:

check-outdated:
  image: composer
  stage: test
  allow_failure: true
  script:
  - composer install --no-ansi --no-interaction --no-dev --no-progress --no-scripts
  - composer outdated -D -m --strict

Running that job (and other test jobs) scheduled and skip the deployment jobs with

ter-upload:
  except:
    - schedules

lets you monitor the version state of your projects.