[GithubRelease],[GithubTag] filter by prefix

[mvndaai]

This change allows:

• filtering github releases/tags by a prefix as requested in Support filtering by prefix in GitHub latest Release and Tag Badges #6275
• trimming tag prefix before '/' using graphql refPrefix query

[shields-ci]

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[calebcartwright]

Thanks for the PR @mvndaai!

One possible complication/bug in the code, especially for the tests, is that it requests the most recent 100 tags so if a prefix is further than 100 tags away it will ignore the prefix.

This is true but unrelated to the addition of this PR, and more just another impact of the fact that we don't support walking the pages for releases/tags yet (refs #6766); I wouldn't worry about this

[calebcartwright]

Thanks again, few items left inline for your review

[calebcartwright]

As I was reading through the diff again I was starting to feel like I'd be more comfortable with a greater number of tests, and I definitely feel that way after getting to this test, which is using the no-longer valid/existent query parameter name.

I think it would be helpful to try to move more of the logic out of the handle function(s) (which are more difficult to test) into standalone functions (either class members or free functions) that can be directly unit tested and consumed by handle and/or fetch functions as needed

[mvndaai]

I fixed that test. I had assumed that Joi.date().required() meant that the string had to be only a date, not just include one. Since all that repo's tags are something like galactic/2022-10-04 it matched on all tags, which is disappointing because originally I had made a regex to just match the date but switched to Joi.date instead on feedback. Now It checks for a date and a prefix of 20.

I just reviewed the code and I don't know how much more I can break up. I could maybe make a function of splitting the prefix when you want to trim but that doesn't feel complex enough to need a function. If you have some pointers I would gladly take them.

Thanks for all the time you have spent reviewing this!

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[chris48s]

Hello. We have just shipped a new feature which allows you to pass an arbitrary filter to the github tag and release badges. For example

The filter param can be used to apply a filter to the project's tag or release names before selecting the latest from the list. Two constructs are available: * is a wildcard matching zero or more characters, and if the pattern starts with a !, the whole pattern is negated.

e.g:
https://img.shields.io/github/v/tag/badges/shields
https://img.shields.io/github/v/tag/badges/shields?filter=%21server-%2A

This feature should be powerful and flexible enough to enable this use-case (and a bunch of others).