chore: fix pushing image pipeline broken

[andyzhangx]

What type of PR is this?
/kind failing-test

What this PR does / why we need it:
trying to fix following image push error:

https://storage.googleapis.com/kubernetes-jenkins/logs/post-csi-driver-nfs-push-images/1505022117538697216/build-log.txt

Dockerfile:21
--------------------
  19 |     
  20 |     # Copy nfsplugin from build _output directory
  21 | >>> COPY bin/${ARCH}/nfsplugin /nfsplugin
  22 |     
  23 |     RUN apt update && apt-mark unhold libcap2
--------------------
error: failed to solve: failed to compute cache key: failed to calculate checksum of ref iiep4siygqcc5hgky6t6fme3l::ghhr8b16cjp4zwohx9ri9j1p1: "/bin/amd64/nfsplugin": not found
+ docker buildx rm multiarchimage-buildertest
make: *** [release-tools/build.make:149: push-multiarch-nfsplugin] Error 1
ERROR
ERROR: build step 0 "gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20210917-12df099d55" failed: step exited with non-zero status: 2

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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[coveralls]

Pull Request Test Coverage Report for Build 2022476853

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 77.868%

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Totals
Change from base Build 2007468092:	0.0%
Covered Lines:	577
Relevant Lines:	741

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💛 - Coveralls