Update gitlab-ci for 5.0.3

.gitlab-ci.yml

@@ -5,12 +5,12 @@ stages:
 - build
 
 variables:
-  VERSION: 4.9.2-fpm
+  VERSION: 5.0.3-fpm
   CACHETAG: build
-  DOCKER_HOST: tcp://${CI_REGISTRY}-leenooks-ci-docker:2375
+  DOCKER_HOST: tcp://docker:2375
 
 services:
-- ${CI_REGISTRY}/leenooks/ci-docker:dind
+- docker:dind
 
 before_script:
 - docker info
@@ -37,5 +37,6 @@ build:
   - docker push ${CI_REGISTRY_IMAGE}:${CACHETAG}
   tags:
   - docker
+  - x86_64
   only:
   - master