[OOM] make helm3 linting to work

chartmuseum was killed by Jenkins when launched. By moving it's outputs
to /dev/null, it's no longer the case.

Issue-ID: OOM-1
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: Ie358e73a498106ac3abf3731f47a1cb8f01deace
1 file changed