Allow configuration of GradleVersionsServiceUrl

[isker]

What would you like Renovate to be able to do?
Following up on #3038 (comment) (cc @rarkins @jansauer), we have a use case where (within an internal environment: self-hosted GitLab, etc), we'd like to configure Renovate to upgrade Gradle only to versions that are hosted at internal locations.

More broadly, Gradle officially supports creating custom redistributions of Gradle and it'd be nice if users had a way to direct Renovate to these versions.

Describe the solution you'd like
If users could configure this URL:

renovate/lib/datasource/gradle-version/index.ts

Line 6 in adf707f

const GradleVersionsServiceUrl = 'https://services.gradle.org/versions/all';

Renovate could be directed to a custom list of versions of Gradle, including ones that are not publicly available, and everything else should just work.

I am not sure exactly how this should be configured; I am not very familiar with Renovate and there seems to have been uncertainty about how to do it in the linked PR before configuration of this value was abandoned entirely. Feedback appreciated!

Thanks for considering.

[isker]

I took a stab at this using registryUrls and got it working with my internal use-case. Opened a PR with the results.

[renovate-release]

🎉 This issue has been resolved in version 19.64.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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