Fix docker buildx build

[Karthik-K-N]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #629

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

[netlify]

✅ Deploy Preview for kubernetes-sigs-cluster-api-ibmcloud ready!

Name	Link
🔨 Latest commit	ea3cdcb
🔍 Latest deploy log	https://app.netlify.com/sites/kubernetes-sigs-cluster-api-ibmcloud/deploys/6255401eb514f60008b0a0e6
😎 Deploy Preview	https://deploy-preview-630--kubernetes-sigs-cluster-api-ibmcloud.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[mkumatag]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Karthik-K-N, mkumatag

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [mkumatag]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[mkumatag]

@Karthik-K-N image pushed: gcr.io/k8s-staging-capi-ibmcloud/powervs-cloud-controller-manager:9b99b4e_a6bfa07

[Karthik-K-N]

gcr.io/k8s-staging-capi-ibmcloud/powervs-cloud-controller-manager:9b99b4e_a6bfa07

Nice, I think i can update the image in deployment now. But will the image name conflict?

[mkumatag]

gcr.io/k8s-staging-capi-ibmcloud/powervs-cloud-controller-manager:9b99b4e_a6bfa07

Nice, I think i can update the image in deployment now. But will the image name conflict?

conflict with what?

[Karthik-K-N]

I was just thinking , will the newly built images in future conflict with the existing, Since we use same image tag.

[mkumatag]

I was just thinking , will the newly built images in future conflict with the existing, Since we use same image tag.

When we change the sha, image will have a different tag. If we rebuild the same image with same tag then it will just overwrite the existing image. I don't see issue in both the cases.