docs: ko does not works without -bare option for ECR

[mattn]

https://ko.build/advanced/lambda/

KO_DOCKER_REPO=[account-id].dkr.ecr.[region].amazonaws.com/my-repo
image=$(ko build ./cmd/app)

This does not work on my environment.

2024/05/27 00:11:15 Publishing XXXXXXXXXXXXXX.dkr.ecr.ap-northeast-3.amazonaws.com/ko-example/ko-example-yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy:latest
Error: failed to publish images: error publishing ko://ko-example: writing sbom: POST https://XXXXXXXXXXXXXX.dkr.ecr.ap-northeast-3.amazonaws.com/v2/ko-example/ko-example-yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy/blobs/uploads/: NAME_UNKNOWN: The repository with name 'ko-example/ko-example-yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy' does not exist in the registry with id 'XXXXXXXXXXXXXX'

[mattn]

As far as I did digging for this, AWS ECR does not work without --bare option.

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