Fix environment variable for postgres database

[uidzeroo]

Description

In the current scripts a wrong environment variable is used for the postgres database and therefore the current variable has no influence on the name of the postgres database. When creating the postgres database, the default behavior of postgres is currently applied (username as database name).

Motivation and Context

The pull request simply replaces the incorrect variable POSTGRES_DATABASE with the correct POSTGRES_DB (See https://hub.docker.com/_/postgres) so that this functionality can be used correctly.

How Has This Been Tested?

A new container with a customized database name was created and verified within the container.

Screenshots (if appropriate):

Types of changes

• Chore (a change that does not modify the application functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Documentation updates are needed, and have been made accordingly.
• I have added and/or updated tests to cover my changes.
• All new and existing tests passed.
• My changes include a database migration.

[github-actions]

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[uidzeroo]

I have read the CLA Document and I hereby sign the CLA

[superlinkx]

Thanks for submitting this! Especially appreciate taking the effort to clean related env var names to be more consistent with the correct env var as well