Allow GDAL/GEOS library path overrides - see HEA-760

Author: rhunwicks

hea/settings/base.py

@@ -318,3 +318,7 @@
 
 PRIVACY_URL = "https://help.fews.net/fdp/privacy-policy"
 DISCLAIMER_URL = "https://help.fews.net/fdp/data-and-information-use-and-attribution-policy"
+
+# Allow GDAL/GEOS library path overrides to be set in the environment, for MacOS.
+GDAL_LIBRARY_PATH = env("GDAL_LIBRARY_PATH", default=None)  # For example, /opt/homebrew/lib/libgdal.dylib
+GEOS_LIBRARY_PATH = env("GEOS_LIBRARY_PATH", default=None)  # For example, /opt/homebrew/lib/libgeos_c.dylib