Can't Extend A Remote Config That Extends A Local Config

[Kurt-von-Laven]

Describe the bug
When you extend a config in a different repository that extends a config within said repository, the keys from the parent config are properly incorporated, but the grandparent config is completely ignored.

To Reproduce
Steps to reproduce the behavior:

1. Extend a config such as ours, which extends a local config.
2. Run MegaLinter on your project.
3. Observe that none of the settings in the base config are respected.

Expected behavior
I expected the inheritance to apply recursively.

Additional context
There were recent fixes for extending local files and extending recursively, but the case where both features are combined isn't handled properly. Renovate has sophisticated support for config inheritance, which may be a helpful reference. One solution might be to specify the base (e.g., repo) URL in one config key and the path relative to the base URL in another.

[bdovaz]

Are you going to work on it? I see that you are quite clear about the implementation.

However, you should keep in mind that it should not break what already works, ie:

1. being able to indicate an absolute url without any limitation. In that system you mention does not work with Azure DevOps for example.
2. To be able to continue indicating local relative paths.

In the meantime I am going to create a PR to organize the existing input files for these tests that may help you as there is a bit of chaos right now.

[Kurt-von-Laven]

Thank you for cleaning up the tests! Yeah, the ability to pass an array of objects to EXTENDS, each with a base and relative URL, would achieve all these goals. Happy to work on it, but wanted to get a bit of feedback on this approach before diving in.

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