Run a check upon exec into container and check if SENZING_ENGINE_CONFIGURATION_JSON is blank

[antaenc]

Utilise something like .bashrc (in /root/.bashrc) to check if SENZING_ENGINE_CONFIGURATION_JSON is blank. If it is display message it needs to be set and a template of how to:

1. Run docker run with --env SENZING_ENGINE_CONFIGURATION_JSON
2. Add the equivalent of 1 to docker compose yaml
3. Manually export it for the current session

[antaenc]

Correction, it's set and blank when specifying it in a docker compose file: SENZING_ENGINE_CONFIGURATION_JSON: ${SENZING_ENGINE_CONFIGURATION_JSON}

Check should be is it unset and is it set and blank.