S3 で bucket ごと public にする

bucket policy に下記を記載($bucket_name は適に)

{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "AllowPublicRead",
      "Effect": "Allow",
      "Principal": "*",
      "Action": "s3:GetObject",
      "Resource": "arn:aws:s3:::$bucket_name/*"
    }
  ]
}