Non-interactive ruby installation on ci
Non-interactive ruby installation on ci

Signed-off-by: Difan Zhao <d4b657a67385123ddb690ebdb0d79b9c6cd38927@pivotal.io>

hyenaspots/cli,fujitsu-cf/cli,markstgodard/cli,markstgodard/cli,simonleung8/cli,markstgodard/cli,simonleung8/cli,hyenaspots/cli,simonleung8/cli,hyenaspots/cli,fujitsu-cf/cli,fujitsu-cf/cli,markstgodard/cli,hyenaspots/cli