[Quality Evaluator] add UDRG DB env vars to the QE Docker Compose file

Add the following env vars to the Docker compose file:

 RULES_DB_HOSTNAME=${RULES_DB_HOSTNAME}
 RULES_DB_PORT=${RULES_DB_PORT}
 RULES_DB_USERNAME=${RULES_DB_USERNAME}
 RULES_DB_PASSWORD=${RULES_DB_PASSWORD}
 RULES_DB_DBNAME=${RULES_DB_DBNAME}

/cc @imurua , @tasosnik