message: pip --no-cache-dir
  See if that helps with memory issues...
diff: @@ -51,7 +51,7 @@ ADD .github/build-requirements.txt /
  ADD .github/test-requirements.txt /
  RUN pip3 install -r build-requirements.txt
  -RUN pip3 install -r test-requirements.txt
  +RUN pip3 --no-cache-dir install -r test-requirements.txt
  # apt clean up
  RUN apt autoremove && rm -rf /var/lib/apt/lists/*
  