Attempt to get CI working

JenkinsFile

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+pipeline {
+ 	agent none
+ 	stages {
+ 		stage('PHP 7.4RC6') {
+ 			agent {
+ 				docker {
+ 					image 'php:7.4.0RC6-alpine'
+ 					args '-u root --privileged'
+ 				}
+ 			}
+ 			steps {
+ 				sh 'apk add --no-cache php7-phpdbg'
+ 				sh 'curl -sS https://getcomposer.org/installer | php'
+ 				sh 'php composer.phar install --ignore-platform-reqs'
+ 				sh 'phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never'
+ 			}
+ 		}
+ 	}
+ }