Update ngen worker image with support for OWP LSTM BMI module

Issue #526 expected to also include support for the OWP LSTM module, but because of the complexity, that will need to be handled separately. The primary reasons for this are:

the module depends on a specific, rather old version of xarray (0.16.0), but the image already installs 2024.2.0
as discussed in the readme and how-to files for use with NextGen (current readme and how-to permalinks, just in case), enough tricks seem to be required to get paths to all line up correctly that this probably deserves attention on its own

NOAA-OWP / DMOD

Update ngen worker image with support for OWP LSTM BMI module #529