Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -10,6 +10,14 @@ variables:
   CI_REGISTRY: gitlab.fi.muni.cz:5050/inject/container-registry/$CI_REGISTRY_IMAGE
   IMAGE_TAG: $CI_REGISTRY:$VER
   IMAGE_LATEST: $CI_REGISTRY:latest
+  # using "docker" as the host is only possible if you alias the service below
+  DOCKER_HOST: tcp://docker:2375 
+  # could be wrong here but although Docker defaults to overlay2, 
+  # Docker-in-Docker (DIND) does not according to the following GitLab doc: 
+  # https://docs.gitlab.com/ee/ci/docker/using_docker_build.html#use-the-overlayfs-driver
+  DOCKER_DRIVER: overlay2
+  DOCKER_TLS_CERTDIR: ""
+
 
 default:
   tags:
@@ -47,6 +55,7 @@ create-image:
   services:
     - name: docker:20.10.16-dind
       alias: docker
+      command: ["--tls=false"]
   stage: buildimage
   only:
     refs: