Fix ci

Fix the CI after octave's update:

• octave segfaults at exit if the netcdf package is built with the system hdf5 libraries; build a local version of libhdf5, and use that to build both netcdf and netcdf-cxx
• initialize octave's interpreter in module-octave
• add a suitable pkg local_list to .octaverc so that module-octave can find the octave's packages built by the CI system; this is because they are not stored in a standard location