Use this policy to sing in and upload images.

EcrLoginUpload.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "ecr:GetAuthorizationToken"
            ],
            "Resource": "*",
            "Effect": "Allow"
        },
        {
            "Action": [
                "ecr:BatchCheckLayerAvailability",
                "ecr:BatchGetImage",
                "ecr:CompleteLayerUpload",
                "ecr:GetDownloadUrlForLayer",
                "ecr:InitiateLayerUpload",
                "ecr:PutImage",
                "ecr:UploadLayerPart"
            ],
            "Resource": "*",
            "Effect": "Allow"
        }
    ]
}