prow image build jobs are failing

[Rakshith-R]

What happened:

https://prow.k8s.io/job-history/gs/kubernetes-ci-logs/logs/post-external-snapshot-metadata-push-images
https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/post-external-snapshot-metadata-push-images/1857444672650088448
Errors

if ! [ "main" ]; then \
	echo >&2 "ERROR: PULL_BASE_REF must be set to 'master', 'release-x.y', or a tag name."; \
	exit 1; \
fi

+ : 'ERROR: release image gcr.io/k8s-staging-sig-storage/csi-snapshot-metadata:main already exists: a new tag is required!'
+ exit 1
+ docker buildx rm multiarchimage-buildertest
multiarchimage-buildertest removed
make: *** [release-tools/build.make:149: push-multiarch-csi-snapshot-metadata] Error 1
ERROR
ERROR: build step 0 "gcr.io/k8s-testimages/gcb-docker-gcloud:v20230623-56e06d7c18" failed: step exited with non-zero status: 2

What you expected to happen:

images should be built and pushed successfully.

How to reproduce it:

Anything else we need to know?:

Environment:

• Driver version:
• Kubernetes version (use kubectl version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: