OCPCLOUD-3173: Enable gcp spot instances

[RadekManak]

Replaces #2488. Updates ProvisioningModel to be pointer type.

• add ProvisioningModel to enable gcp spot instances

[openshift-ci-robot]

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[openshift-ci-robot]

@RadekManak: This pull request references OCPCLOUD-3173 which is a valid jira issue.

In response to this:

Replaces #2488. Updates ProvisioningModel to be pointer type.

• add ProvisioningModel to enable gcp spot instances

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[openshift-ci]

Hello @RadekManak! Some important instructions when contributing to openshift/api:
API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[damdo]

/assign @JoelSpeed @damdo

[damdo]

/approve

[damdo]

/lgtm

[JoelSpeed]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: damdo, JoelSpeed

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[RadekManak]

/verified by @RadekManak
Controller openshift/machine-api-provider-gcp#133 and openshift/machine-api-operator#1428 webhook implementation.

[openshift-ci-robot]

@RadekManak: This PR has been marked as verified by @radekmanak.

In response to this:

/verified by @RadekManak
Controller openshift/machine-api-provider-gcp#133 and openshift/machine-api-operator#1428 webhook implementation.

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[openshift-ci]

@RadekManak: all tests passed!

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