helpers:githubDigestChangelogs preset does not seem to work for us

[haines]

How are you running Renovate?

A Mend.io-hosted app

Which platform you running Renovate on?

GitHub.com

Which version of Renovate are you using?

43.110.2

Please tell us more about your question or problem

#39650 added the helpers:githubDigestChangelogs preset as suggested in #3964. We've configured that helper but aren't seeing changelogs.

For example, cerbos/cerbos-sdk-ruby#311 includes this change:

- uses: rubygems/configure-rubygems-credentials@f623036f13ddde19c3dc555bdcc20059c18dc042 # main
+ uses: rubygems/configure-rubygems-credentials@3d549bd0e55c3910ffb5515bf38d6e7f3e5be570 # main

The PR body does not include a changelog of any sort for this:

Logs (if relevant)

Logs

https://developer.mend.io/github/cerbos/cerbos-sdk-ruby/-/job/a78c3a11-cff7-417c-bf32-f28ac6366483

DEBUG: LibYears: no releaseTimestamp for rubygems/configure-rubygems-credentials update to undefined

DEBUG: packageFiles with updates
{
  "baseBranch": "main",
  "config": {
    ...,
    "github-actions": [
      ...,
      {
        "deps": [
          ...,
          {
            "depName": "rubygems/configure-rubygems-credentials",
            "commitMessageTopic": "{{{depName}}} action",
            "versioning": "exact",
            "depType": "action",
            "replaceString": "rubygems/configure-rubygems-credentials@f623036f13ddde19c3dc555bdcc20059c18dc042 # main",
            "autoReplaceStringTemplate": "{{depName}}@{{#if newDigest}}{{newDigest}}{{#if newValue}} # {{newValue}}{{/if}}{{/if}}{{#unless newDigest}}{{newValue}}{{/unless}}",
            "currentValue": "main",
            "currentDigest": "f623036f13ddde19c3dc555bdcc20059c18dc042",
            "datasource": "github-digest",
            "updates": [
              {
                "updateType": "digest",
                "newValue": "main",
                "newDigest": "3d549bd0e55c3910ffb5515bf38d6e7f3e5be570",
                "branchName": "renovate/dependencies"
              }
            ],
            "packageName": "rubygems/configure-rubygems-credentials",
            "warnings": [],
            "sourceUrl": "https://github.com/rubygems/configure-rubygems-credentials",
            "registryUrl": "https://github.com",
            "currentVersion": "main",
            "currentVersionTimestamp": "2026-04-07T02:57:56.000Z",
            "currentVersionAgeInDays": 6,
            "fixedVersion": "main"
          },
          ...
        ],
        "packageFile": ".github/workflows/release.yaml"
      },
      ...
    ],
    ...
  }
}

DEBUG: Marking 1 release(s) as pending, as they do not have a releaseTimestamp and we're running with minimumReleaseAgeBehaviour=timestamp-required (branch="renovate/dependencies")
{
  "updates": [
    {
      "depName": "rubygems/configure-rubygems-credentials",
      "updateType": "digest"
    }
  ]
}

DEBUG: branches info extended
{
  "branchesInformation": [
    {
      "branchName": "renovate/dependencies",
      "prNo": 311,
      "prTitle": "Update dependencies",
      "result": "done",
      "upgrades": [
        ...
        {
          "datasource": "github-digest",
          "depName": "rubygems/configure-rubygems-credentials",
          "displayPending": "",
          "fixedVersion": "main",
          "currentVersion": "main",
          "currentValue": "main",
          "currentDigest": "f623036f13ddde19c3dc555bdcc20059c18dc042",
          "newValue": "main",
          "newDigest": "3d549bd0e55c3910ffb5515bf38d6e7f3e5be570",
          "packageFile": ".github/workflows/release.yaml",
          "updateType": "digest",
          "packageName": "rubygems/configure-rubygems-credentials"
        },
        ...
      ]
    },
    ...
  ]
}