Create udev rule via Ignition

udev-rule.json

{
  "ignition": {
    "version": "2.2.0"
  },
  "storage": {
    "files": [
      {
        "filesystem": "root",
        "path": "/etc/udev/rules.d/39-redhat.rules",
        "mode": 420,
        "contents": {
          "source": "data:text/plain;base64,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"
        }
      }
    ]
  }
}