[Dashboard] Explicit dashboard run options should override environment values #19779

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

DashboardRunCommand.AddStringOptionArg checks whether the mapped environment setting exists before reading an explicitly supplied CLI option. If it exists, --persistence or --application-name is not forwarded to the Dashboard, so the inherited environment value wins.

This can persist data despite an explicit --persistence None, or select a different Resume database than the application name supplied on the command line.

Expected Behavior

Explicit CLI options should take precedence over inherited environment values.

Steps To Reproduce

1. Set ASPIRE_DASHBOARD_PERSISTENCE_MODE=Run.
2. Run aspire dashboard run --persistence None.
3. Inspect the child Dashboard arguments or resulting storage mode.
4. The environment value is used instead of the explicit CLI value.

Exceptions (if any)

N/A

Aspire doctor output

Aspire CLI 13.6.0-pr.18924.g5ee63941
Windows 10.0.26200 and Ubuntu 24.04.3

Anything else?

Related to #18924. Source: src/Aspire.Cli/Commands/DashboardRunCommand.cs:181-216,244-269. The same implementation remains on current main.