fix docker

.gitlab-ci.yml

@@ -116,7 +116,7 @@ test:
     expire_in: 1 week
 
 test_debian:
-  tags: [docker]
+  tags: [cached-dind]
   stage: test
   image: debian:buster
   script:
@@ -141,8 +141,6 @@ test_debian:
       - mariadb_log.txt
     when: on_failure
     expire_in: 1 week
-  variables:
-    DOCKER_HOST: tcp://localhost:2376
 
 build-testenv:
   tags: [cached-dind]