[ci] added privileged flag for docker

.gitlab-ci.yml

@@ -31,6 +31,7 @@ build_image:
     # - if [[ $CI_RUNNER_TAGS == *"docker,"* ]]; then git config --global --add safe.directory ${CI_PROJECT_DIR}; fi
     # - ln -s /usr/bin/podman /usr/bin/docker
     # - docker info
+    - docker run --privileged
   script:
     - buildah bud -t docker.idiap.ch/bob/bdt:latest .