Allow storage projections other than 4326 for Postgres Provider (#1953)

* Update postgresql.py

* fix lint

pygeoapi/provider/postgresql.py

@@ -108,6 +108,14 @@ def __init__(self, provider_def):
         LOGGER.debug(f'ID field: {self.id_field}')
         LOGGER.debug(f'Geometry field: {self.geom}')
 
+        # conforming to the docs:
+        # https://docs.pygeoapi.io/en/latest/data-publishing/ogcapi-features.html#connection-examples # noqa
+        self.storage_crs = provider_def.get(
+            'storage_crs',
+            'https://www.opengis.net/def/crs/OGC/0/CRS84'
+        )
+        LOGGER.debug(f'Configured Storage CRS: {self.storage_crs}')
+
         # Read table information from database
         options = None
         if provider_def.get('options'):
@@ -416,7 +424,7 @@ def _feature_to_sqlalchemy(self, json_data, identifier=None):
             # NOTE: for some reason, postgis in the github action requires
             # explicit crs information. i think it's valid to assume 4326:
             # https://portal.ogc.org/files/108198#feature-crs
-            srid=4326
+            srid=pyproj.CRS.from_user_input(self.storage_crs).to_epsg()
         )
         attributes[self.id_field] = identifier