Revert "[CI] Use detached step instead of service to run dockerd only after linters"

This reverts commit d9f5a34392.

.drone.yml

@@ -25,16 +25,6 @@ steps:
   commands:
     - mdl --style all --warnings .
 
-# use detached image / service to run dockerd
-# services:
-- name: docker
-  image: docker:18.09-dind
-  environment:
-    DOCKER_TLS_CERTDIR: ""
-  command: [ "--storage-driver=vfs", "--tls=false" ]
-  privileged: true
-  detached: true
-
 - name: build image
   image: docker:stable
   environment:
@@ -48,3 +38,10 @@ steps:
   - docker login -u $USERNAME -p $PASSWORD
   - docker image push kleph/beer
 
+services:
+  - name: docker
+    image: docker:18.09-dind
+    environment:
+      DOCKER_TLS_CERTDIR: ""
+    command: [ "--storage-driver=vfs", "--tls=false" ]
+    privileged: true