This enables chartmuseum binary v0.12.0 as a download target
instead of expecting a tarball. This is looking for the specific
tarball-dl.lst entry !chartmuseum-v0.12.0-amd64 .
The chartmuseum binary is required to build helm charts.
Change-Id: Iae7f3543313894310c85f6c55bb6d8f58cfb71ae
Story: 2007000
Task: 38893
Signed-off-by: Jim Gauld <james.gauld@windriver.com>