fix(docker): setup ROOT_DIR

this var is required to determin if inclusion is as submodule or not
see failed jobs nofusscomputing/projects/ansible/execution_environment!3
and
nofusscomputing/projects/docker-buildx-qemu!1

!22 nofusscomputing/projects/ansible/execution_environment!3 nofusscomputing/projects/docker-buildx-qemu!1

type/docker-image.gitlab-ci.yaml

@@ -37,6 +37,8 @@ variables:
     # See https://github.com/docker-library/docker/pull/166
     DOCKER_TLS_CERTDIR: ""
   before_script:
+    - if [ "0$JOB_ROOT_DIR" == "0" ]; then ROOT_DIR=gitlab-ci; else ROOT_DIR=$JOB_ROOT_DIR ; fi
+    - echo "[DEBUG] ROOT_DIR[$ROOT_DIR]"
     - docker info
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
     #- pip3 install -r gitlab-ci/gitlab_release/requirements.txt