Alerts for ECR Image Scan Vulnerabilities

# Create EventBridge event alerts when there are CRITICAL severity vulnerabilities in an ECR Image Scan
{
  "detail-type": [
    "ECR Image Scan"
  ],
  "source": [
    "aws.ecr"
  ],
  "detail": {
    "finding-severity-counts": {
      "CRITICAL": [{
        "numeric": [
          ">",
          0
        ]
      }]
    }
  }
}