added missing rm

Author: schmunk42

.gitlab-ci.yml

@@ -54,7 +54,7 @@ test:php:allow-fail:
   stage: php-test
   script:
     - cd php-7.0
-    - docker run ${STACK_PHP_IMAGE} sh -c 'composer global update --dry-run; composer diagnose'
+    - docker run --rm ${STACK_PHP_IMAGE} sh -c 'composer global update --dry-run; composer diagnose'
   allow_failure: true
   except:
     - tags