def ci_provider
return 'AWS CodeBuild' if ENV.key?('CODEBUILD_BUILD_ARN')
return 'Azure Pipelines' if ENV.key?('SYSTEM_TEAMFOUNDATIONCOLLECTIONURI')
return 'Bamboo' if ENV.key?('bamboo_planKey')
return 'Bitbucket Pipelines' if ENV.key?('BITBUCKET_COMMIT')
return 'Buddy.works' if ENV.key?('BUDDY')
return 'Drone.io' if ENV.key?('DRONE')
return 'Google Cloud Build' if ENV.key?('BUILDER_OUTPUT')
return 'Jenkins' if ENV.key?('JENKINS_URL')
return 'TeamCity' if ENV.key?('TEAMCITY_VERSION')
return 'Other' if KnapsackPro::Config::Env.ci?
nil
end