renovate-test-target/renovate.json

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "regexManagers": [
    {
      "fileMatch": [
        "^host-.*.yml$",
        "^host_vars/.*/vars.yml$"
      ],
      "datasourceTemplate": "docker",
      "versioningTemplate": "docker",
      "matchStrings": [
        "image: (?<depName>.*?):(?<currentValue>.*?)(@(?<currentDigest>sha256:.*?))?\\s"
      ]
    }
  ],
  "packageRules": [
    {
      "matchPackageNames": ["renovate/renovate"],
      "schedule": [ "on friday" ]
    }
  ]
}