Fix scripts for docker-compose examples to honor PostgreSQL/OpenSearch env vars #37

Job	Run time
Lint GitHub Actions workflows	4s
Test docker-compose-tls.yml	2m 35s
Test docker-compose-multirole.yaml	1m 30s
Test docker-compose-postgres-opensearch.yml	1m 7s
Test docker-compose-mysql-es.yml	1m 8s
Test docker-compose-cass-es.yml	1m 7s
Test docker-compose.yml	54s
Test docker-compose-mysql.yml	57s
Test docker-compose-postgres.yml	49s
	10m 11s

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