feat(db): Support passing db connection as separate env vars

[brendan-kellam]

Allows for constructing the database URL as separate environment variables: DATABASE_HOST, DATABASE_USERNAME, DATABASE_PASSWORD, DATABASE_NAME, and DATABASE_ARGS

Fixes #540

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

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• Commit unit tests in branch bkellam/db_connection_username

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