problem with build pipeline

https://gitlab.kwant-project.org/quantum-sensing-and-measurement/quantum-sensing-and-measurement/-/jobs/157347

$ python execute.py
Traceback (most recent call last):
  File "execute.py", line 66, in <module>
    'metadata': {'path': 'src/code'}
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/exporters/templateexporter.py", line 307, in from_notebook_node
    nb_copy, resources = super(TemplateExporter, self).from_notebook_node(nb, resources, **kw)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 139, in from_notebook_node
    nb_copy, resources = self._preprocess(nb_copy, resources)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 316, in _preprocess
    nbc, resc = preprocessor(nbc, resc)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/preprocessors/base.py", line 47, in __call__
    return self.preprocess(nb, resources)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 403, in preprocess
    with self.setup_preprocessor(nb, resources, km=km):
  File "/opt/conda/lib/python3.7/contextlib.py", line 112, in __enter__
    return next(self.gen)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 345, in setup_preprocessor
    self.km, self.kc = self.start_new_kernel(**kwargs)
  File "/opt/conda/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 296, in start_new_kernel
    kc.wait_for_ready(timeout=self.startup_timeout)
  File "/opt/conda/lib/python3.7/site-packages/jupyter_client/blocking/client.py", line 108, in wait_for_ready
    raise RuntimeError("Kernel didn't respond in %d seconds" % timeout)
RuntimeError: Kernel didn't respond in 60 seconds
Running after_script
00:02
Uploading artifacts for failed job
00:03
Authenticating with credentials from /root/.docker/config.json
ERROR: Job failed: exit code 1