ORS docker installation fails ?

ORS_UID=${UID} ORS_GID=${UID} docker-compose up 2>&1 | tee /tmp/erska
has issues:

ConnectionError: ('Connection aborted.', PermissionError(13, 'Permission denied'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/bin/docker-compose", line 33, in
sys.exit(load_entry_point('docker-compose==1.29.2', 'console_scripts', 'docker-compose')())
File "/usr/lib/python3/dist-packages/compose/cli/main.py", line 81, in main
command_func()
File "/usr/lib/python3/dist-packages/compose/cli/main.py", line 200, in perform_command
project = project_from_options('.', options)
File "/usr/lib/python3/dist-packages/compose/cli/command.py", line 60, in project_from_options
return get_project(
File "/usr/lib/python3/dist-packages/compose/cli/command.py", line 152, in get_project
client = get_client(
File "/usr/lib/python3/dist-packages/compose/cli/docker_client.py", line 41, in get_client
client = docker_client(
File "/usr/lib/python3/dist-packages/compose/cli/docker_client.py", line 170, in docker_client
client = APIClient(use_ssh_client=not use_paramiko_ssh, **kwargs)
File "/usr/lib/python3/dist-packages/docker/api/client.py", line 197, in __init__
self._version = self._retrieve_server_version()
File "/usr/lib/python3/dist-packages/docker/api/client.py", line 221, in _retrieve_server_version
raise DockerException(
docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', PermissionError(13, 'Permission denied'))

And with root:
root@foobar:/srv/openRouting/openRouteService# docker-compose up
Building ors-app
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
Install the buildx component to build images with BuildKit:
https://docs.docker.com/go/buildx/

Sending build context to Docker daemon 15.87kB
Error response from daemon: unexpected error reading Dockerfile: read /var/lib/docker/tmp/docker-builder1002132981/Dockerfile: is a directory
ERROR: Service 'ors-app' failed to build : Build failed
root@serveri:/srv/openRouting/openRouteService#