Added a CI/CD build Dockerfile for jupyterlab to create an image with the...

Added a CI/CD build Dockerfile for jupyterlab to create an image with the current nomad-lab Python package.

docker/jupyterlab/Dockerfile

+# Create a build stage from the current nomad dev_python image to copy the nomad-lab
+# distribution
+FROM gitlab-registry.mpcdf.mpg.de/nomad-lab/nomad-fair/dev_python:develop AS dev_python
+
+FROM jupyter/datascience-notebook
+
+COPY --from=dev_python /app/dist/nomad-lab-*.tar.gz .
+RUN pip install nomad-lab-*.tar.gz