renovate.json

{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": [
    "config:recommended"
  ],
  "rollbackPrs": true,
  "customDatasources": {
    "local-generic": {
      "defaultRegistryUrlTemplate": "file://versions.json",
      "transformTemplates": [
        "{ \"releases\": $map($, function($v) { { \"version\": $v.version, \"sourceUrl\": $v.filelink } }) }"
      ]
    }
  },
  "customManagers": [
    {
      "customType": "regex",
      "description": "Update _VERSION variables in Dockerfiles",
      "fileMatch": ["(^|/|\\.)Dockerfile$", "(^|/)Dockerfile\\.[^/]*$"],
      "matchStrings": [
        "# renovate: datasource=(?<datasource>[a-z-.]+?) depName=(?<depName>[^\\s]+?)(?: (lookupName|packageName)=(?<packageName>[^\\s]+?))?(?: versioning=(?<versioning>[^\\s]+?))?(?: extractVersion=(?<extractVersion>[^\\s]+?))?(?: registryUrl=(?<registryUrl>[^\\s]+?))?\\s(?:ENV|ARG) .+?_VERSION[ =]\"?(?<currentValue>.+?)\"?\\s"
      ]
    }
  ]
}