Settings gradle detection

[csasarak]

Overview

In newer versions of gradle, there may only be a settings.gradle file in a project root directory. We would not be able to discover subprojects in this case and would report no dependencies.

Acceptance criteria

Detect when a project has a top-level file starting with settings.gradle without a build.gradle and also run discovery.

Testing plan

I tested with some sample repositories that had settings.gradle only in their root directories. These included projects in Java/Kotlin. I also wrote an integration test which tests both a real repository (spring-boot) with both files in its root and one of the samples with only settings.gradle.

This project will fail currently on master. On this branch it succeeds and reports dependencies.

Risks

Highlight any areas that you're unsure of, or want reviewers to pay particular attention to.

As part of the integration testing I extended some code in TestFixtureUtils.hs to support more archive formats than just .tar.gz. Please look at how it detects which extraction function to use and also how it reports errors.

References

Closes fossas/team-analysis#846

Checklist

• I added tests for this PR's change (or confirmed tests are not viable).
• If this PR introduced a user-visible change, I added documentation into docs/.
• I updated Changelog.md if this change is externally facing. If this PR did not mark a release, I added my changes into an # Unreleased section at the top.
• I updated *schema.json if I have made changes for .fossa.yml, fossa-deps.{json, yaml, yml}. You may also need to update these if you have added/removed new dependency (e.g. pip) or analysis target type (e.g. poetry).
• I linked this PR to any referenced GitHub issues, if they exist.

[skilly-lily]

Looks like the dep-scan job is stuck. Cancelling doesn't work. Can you push a new commit so that it resubmits?

[skilly-lily]

We can probably mark a release here, go ahead and update the changelog with 3.0.17 and ping me for details on releasing if you need to.