📖 Update Quickstart for GCP Image

[christianh814]

What this PR does / why we need it:

You need to export IMAGE_ID in order for the clusterctl generate cluster ... command to work on GCP.

[k8s-ci-robot]

Hi @christianh814. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[sbueringer]

Thx!

/lgtm
but I don't have CAPG-specific knowledge.
/ok-to-test

[killianmuldoon]

/lgtm

[cpanato]

/lgtm

[stmcginnis]

/lgtm

[fabriziopandini]

Given CAPG maintainers lgtm (thanks @cpanato !)
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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