Fix docker runner

gitlabci/docker-hub.yml

@@ -1,6 +1,6 @@
 docker-hub-build:
   stage: Docker-hub-build
-  image: docker:18.09.7-dind
+  image: docker:19.03.0-dind
   before_script:
     - docker login -u "$DOCKER_HUB_USER" -p "$DOCKER_HUB_TOKEN" $DOCKER_HUB_REGISTRY
   script:
@@ -16,6 +16,7 @@ variables:
   CONTAINER_TEST_NAME: squid
   CONTAINER_BUILD_NOPROD_NAME: $HUB_REGISTRY_IMAGE:build-noprod
   SQUID_VERSION: '"$SQUID_VERSION"'
+  DOCKER_HOST: tcp://localhost:2375
 
 .services:
   services: