Documentation is missing details about volumes

[dgageot]

/kind doc

This page describes what kind of volumes can be made available to "Builds". Three types are listed. Secrets, emptyDir, host Paths.

It would be useful to show a sample for each with a detailed syntax. I had to browse the sources to find that hostPath is a valid volume type and I had to browse Kubernetes api documentation to find valid values for the type.

[dgageot]

Also a sample with a persistent disk would help

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