Add DEBUG_USD_SEED_DATA_PATH in config to make seed data flexible

[kenhktsui]

Closes #322

Factor out fixed seed data by adding DEBUG_USE_SEED_DATA_PATH in config to control seed data to use

[andreaskoepf]

LGTM! Thanks.

[andreaskoepf]

The automatic contract-tests fail with during start of the mock-server with the following error-message:

 pydantic.error_wrappers.ValidationError: 1 validation error for Settings
DEBUG_USE_SEED_DATA_PATH
  file or directory at path "backend/test_data/generic/test_generic_data.json" does not exist (type=value_error.path.not_exists; path=backend/test_data/generic/test_generic_data.json)

Could you please check & fix?

[kenhktsui]

The automatic contract-tests fail with during start of the mock-server with the following error-message:

 pydantic.error_wrappers.ValidationError: 1 validation error for Settings
DEBUG_USE_SEED_DATA_PATH
  file or directory at path "backend/test_data/generic/test_generic_data.json" does not exist (type=value_error.path.not_exists; path=backend/test_data/generic/test_generic_data.json)

Could you please check & fix?

Thanks for checking! The path of test_data now became absolute (dynamically) thanks to yk's suggestion. I could run start-mock-server.sh without error now.