share lib/ and bin/ directories

[oliver-sanders]

Problem

Workflows often build or install libraries and executables at runtime. Where should these be put?

You could put them into the bin/ and lib/ directories, but these would be overwritten by reinstallation, so you would have to list every resource you want to self-manage into the .cylcignore file which is fiddly.

Proposed Solution

Add support for a bin/ and lib/ directory in the share/ directory (i.e. put these in job's PATH and PYTHONPATH vars). This would help to colocate files generated at runtime and avoid the reinstall problem.

[oliver-sanders]

Meeting 2023-03-16: Do it!

[wxtim]

Do we need to create these folders on install, or is that the user's problem?