feat: added support for gradle

[olavtar]

Description

Added support for gradle

Related issue (if any): fixes #issue_number_goes_here

Checklist

• I have followed this repository's contributing guidelines.
• I will adhere to the project's code of conduct.

Additional information

Anything else?

[zvigrinberg]

Hi @olavtar
Please look at the Comments.
the mocks stubbing in the tests should be adjusted in order that the tests will be successful
also there are some minor changes in the code.
In addition, i saw also problem with the comparison between expected and actual stack analysis sbom - https://github.com/RHEcosystemAppEng/exhort-java-api/actions/runs/8441141382/job/23119617921#step:8:747, please check to reveal the cause for that.
anyway, good job!.

[zvigrinberg]

As discussed and agreed, //exhortignore comment as suffix of the line containing dependency , will mark the artifact for exclusion from analysis.

[zvigrinberg]

Hi @olavtar , So it's not only the expiration of the exhort backend that failed the Integration tests, you should also create a minimal simple build.gradle file (maximum 2-3 dependencies), and put it in a new directory gradle in src/test/resources/tst_manifests/it/gradle , like all other package managers. if you need to add properties file, also add it, and also load this file to the IT test only if it's gradle package manager. please try to do the build.gradle with minimum number of dependencies and without any other files dependencies ( maybe only properties file if you have to), Thanks.

This will prevent the nullPointerException that happening in IT Tests.

[zvigrinberg]

@olavtar
Looks pretty good. ( now all tests passing including IT )
Just relate to my 2 minor comments.
and i didn't see documentation of gradle in README.md ( configuration, exhortignore for gradle with example, and etc.)

[zvigrinberg]

@olavtar LGTM, Approved.
Great Job! and thanks for your efforts.
you can merge whenever you ready.

Zvi.