dashboard: add privileged flag for builders
dashboard: add privileged flag for builders

This change adds a privileged flag for builders.

Updates golang/go#47521

Change-Id: Icbc72bc21dd4345da65c2e231f0f59af5dd05ca1
Reviewed-on: https://go-review.googlesource.com/c/build/+/370661
Trust: Carlos Amedee <ab5e2bca84933118bbc9d48ffaccce3bac4eeb64@golang.org>
Run-TryBot: Carlos Amedee <ab5e2bca84933118bbc9d48ffaccce3bac4eeb64@golang.org>
Reviewed-by: Alex Rakoczy <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/build,golang/build,golang/build,golang/build