[CentOS] How do I confirm importing repo key without user intervention?

Hi,

Sorry for asking it again. I just thought I asked the question the
wrong way. Too much unnecessary details. And therefore, got no
replies.

I'm configuring a server from, say, a script (automatically). I need
it to be done without user saying, "Yes, it's okay to import the key."

I was told to run the following command:

    yum makecache -y --disablerepo=* --enablerepo=passenger

Can you confirm if this is okay? Any better ways? Thanks in advance.

Regards,
Yuri