Set DB_PASSWORD to a value that contains %p and/or %c:
replaces %p by hostPort and %c by containerHost. This breaks the credentials, PostgreSQL login fails.
The spec is in the guide: https://github.com/folio-org/okapi/blob/master/doc/guide.md#deployment
The port is passed as %p in the value of properties exec and cmdlineStart.
The value of containerHost can be referred to as %c in dockerArgs of the deployment.
Replace % variables in exec, cmdlineStart and dockerArgs values only.