Add docs about using GCS for object storage

[balasankarc]

Follow up to #1509

[openshift-ci]

Hi @balasankarc. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[balasankarc]

@git-hyagi Sorry for the delay. Only got time to come back and add docs now.

[git-hyagi]

/ok-to-test

[git-hyagi]

Hi @balasankarc
No worries :D
Thank you for another contribution!!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: balasankarc, git-hyagi

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