It appears the rds_backend_db_password variable was changed at some point to be called rds_server_db_password. In general, if more documentation on generating/determining the config values for the Submission Key, Claim Token, Retrieval ECDSA key, and Retrieval HMAC key would be appreciated
Workaround:
Took the values from the test data. Since it is possible to execute the server/portal locally in docker, using docker compose.
Docker-compose.yml contains values:
ECDSA_KEY: 30770201010420a6885a310b694b7bb4ba985459de1e79446dddcd1247c62ece925402b362a110a00a06082a8648ce3d030107a1440342000403eb64f714c4b4ed394331c26c31b7ce7156d00fb28982ad2679a87eaa1a3869802fbeb1d7ee28002762921929c3f7603672d535fcac3d24d57afbb4e2d97f5a
RETRIEVE_HMAC_KEY: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
KEY_CLAIM_TOKEN: thisisatoken=302