renovate/lib/modules/datasource/git-refs/readme.md

You can use this datasource plus regex managers to update git-based dependencies that are not natively supported by Renovate.

The git-refs datasource returns a reference from a Git repository.

The packageName must be a fully qualified domain name.

To fetch the latest digest of a reference instead of the named reference: put the named reference in currentValue and match on the currentDigest.

Usage example

Say you want to maintain the HEAD digest of the master branch of a repository. You would configure a custom manager in your Renovate config file for files named versions.ini:

{
  "customManagers": [
    {
      "customType": "regex",
      "fileMatch": ["^versions.ini$"],
      "matchStrings": ["GOOGLE_API_VERSION=(?<currentDigest>.*?)\\n"],
      "currentValueTemplate": "master",
      "depNameTemplate": "googleapis",
      "packageNameTemplate": "https://github.com/googleapis/googleapis",
      "datasourceTemplate": "git-refs"
    }
  ]
}