Datadir override

[austinorr]

allow app to be used as a FastAPI mount

[codecov]

Codecov Report

Merging #118 (9186d77) into develop (79253ff) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           91        90    -1     
  Lines         4260      4282   +22     
  Branches       592       598    +6     
=========================================
+ Hits          4260      4282   +22     

Impacted Files	Coverage Δ
nereid/nereid/src/network/algorithms.py	100.00% <ø> (ø)
nereid/nereid/src/nomograph/interpolators.py	100.00% <ø> (ø)
nereid/nereid/api/api_v1/async_utils.py	100.00% <100.00%> (ø)
...api/api_v1/endpoints_async/land_surface_loading.py	100.00% <100.00%> (ø)
...ereid/nereid/api/api_v1/endpoints_async/network.py	100.00% <100.00%> (ø)
...ereid/api/api_v1/endpoints_async/reference_data.py	100.00% <100.00%> (ø)
nereid/nereid/api/api_v1/endpoints_async/tasks.py	100.00% <100.00%> (ø)
...api/api_v1/endpoints_async/treatment_facilities.py	100.00% <100.00%> (ø)
...eid/nereid/api/api_v1/endpoints_async/watershed.py	100.00% <100.00%> (ø)
...nereid/api/api_v1/endpoints_sync/reference_data.py	100.00% <100.00%> (ø)
... and 22 more

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