Improve CI with additional runners such as code coverage and perhaps more versions of OpenFOAM

[mattfalcone1997]

Description

Add more CI runners as a vehicle to improve code quality

Context

If Hippo is to be used by users beyond the developers its important that code performs as expected in as wide a number of scenarios. CI gives an indication of potential issues with codebase. Checking features are adequately tested can be indicated by code coverage and prompt refactors to improve Hippo.

Outputs

• Add code coverage badge
• Make sure Hippo works on OpenFOAM 12 and OpenFOAM 13