Allow instance/config and/or config/testing to override default config

src/spiffworkflow_backend/config/__init__.py

@@ -42,6 +42,11 @@ def setup_config(app: Flask) -> None:
 
     app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
     app.config.from_object("spiffworkflow_backend.config.default")
+    # This allows config/testing.py or instance/config.py to override the default config
+    if 'ENV' in app.config and app.config['ENV'] == 'testing':
+        app.config.from_pyfile('config/testing.py', silent=True)
+    else:
+        app.config.from_pyfile(f'{app.instance_path}/config.py', silent=True)
 
     setup_database_uri(app)
     setup_logger(app)