Illuminator simulation generates tempory files in simtools directory

[GernotMaier]

e.g. tests/integration_tests/test_applications_from_config.py::test_applications_from_config[simtools-simulate-light-emission_run-variable] generates temporary files in the main simtools directory (files names are e.g. tmp_14414_0_0.cbunch). They are deleted (by simtools?) automatically.

Would prefer to give an explicit option on where to write these files. Writing into a local directory with possibly limited disk space is not optimal.

[GernotMaier]

If I understand the sim_telarray code correctly is this hardwired in ./sim_telarray/corsika/iact.c (around lines 3250).

Is sim_telarray expected temporary storage in ./? This might affect some run time environments (e.g., the file system in apptainers for readonly (linked directories not)).