fix: Error appearing in some examples while documentation building

[AlejandroFernandezLuces]

Overview

This should fix the error that appears in some of the examples while building the documentation. Fixed by commenting out some plotting related code, and updating the PyVista dependency.

Also seized the oportunity to add closure management of the docker image when there is an unexpected exit.

Important

Github is being messy with the diffs, the only modified example is example 10, and it was modified only in two plotting sections.

Error description

Each of the examples work fine outside Sphinx context. Also, each of the examples work if they are the only example being built in Sphinx. For some unknown reason, some examples fail due to the early closure of its prime service.

Error seems to be related to the visualizer/pyvista/VTK, although it is not clear why an error there would cause the closure of the prime service. Also, it is a silent failure in the visualization part.

• It is possible that there is some incompatibility with XVFB and the code that is being run
• There are some known issues in VTK 9.4. We are using 9.3, but we need to be wary of that.

[AlejandroFernandezLuces]

Working examples in previous commit