Gradle: Add ivy repository support

[hfhbd]

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Feature description

Beside standard maven repositories, you can also define custom ivy repositories in Gradle. Currently, it is not supported.

https://docs.gradle.org/current/userguide/supported_repository_types.html#sec:defining-custom-pattern-layout-for-an-ivy-repository

Use case:
We use a custom ivy repository to point to our maven artifacts that are published as immutable GitHub release assets.