Merge remote-tracking branch 'origin/master' into artifacts-expire-date

CHANGELOG

doc/ci/docker/using_docker_build.md

doc/ci/docker/using_docker_images.md

doc/ci/examples/php.md

doc/ci/runners/README.md

doc/container_registry/README.md

doc/development/instrumentation.md

lib/banzai/pipeline/description_pipeline.rb

lib/ci/gitlab_ci_yaml_processor.rb

lib/gitlab/ci/config.rb

lib/gitlab/ci/config/node/configurable.rb

lib/gitlab/ci/config/node/entry.rb

lib/gitlab/ci/config/node/factory.rb

lib/gitlab/ci/config/node/global.rb

lib/gitlab/ci/config/node/null.rb

lib/gitlab/ci/config/node/script.rb

lib/gitlab/ci/config/node/validation_helpers.rb

lib/gitlab/metrics/instrumentation.rb

spec/lib/gitlab/ci/config/node/configurable_spec.rb

spec/lib/gitlab/ci/config/node/factory_spec.rb