Installation: Added example for GoogleCloudStorage backend

[achedeuzot]

Changes

docs: Added installation example for GoogleCloudStorage backend

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[tekton-robot]

Hi @achedeuzot. Thanks for your PR.

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[afrittoli]

Nice! Thank you!
/ok-to-test
/lgtm

[vdemeester]

/meow

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[tualeron]

I added all changes from this PR to my install guide rewrite: #2104