add google creds to both containers and initContainers

[akakakakakaa]

Hi, I want to use google credentials to initcontainer also.

I think there is common use case that run a container after downloading metadata from initcontainer.

[google-cla]

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[sharifelgamal]

Hey @akakakakakaa, this seems like a reasonable change. If you sign the CLA, I can test and merge it.

[akakakakakaa]

Thank you for your response @sharifelgamal . I changed commit to CLA verified email.