Add helm chart for dashboard deployment

[firefly2442]

The core Volcano repo has an ability to install via Helm. It would be helpful if this also had functionality to install the dashboard via Helm as well.

[JesseStutler]

It's a good suggestion, would you like to contribute?
/help

[volcano-sh-bot]

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In response to this:

It's a good suggestion, would you like to contribute?
/help

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