renovate-test-target/renovate.json

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "regexManagers": [
    {
      "fileMatch": [
        "ansible-test.yml",
        "Containerfile"
      ],
      "datasourceTemplate": "docker",
      "matchStrings": [
        "# renovate: (versioning=(?<versioning>.*?))\n.*_image: (?<depName>.*?):(?<currentValue>.*?)$"
      ],
      "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}"
    }
  ]
}