ci: use junit annotation action

[G-Rath]

No description provided.

[eoinkelly]

Thanks for making this - it really helps to visualise. Am I missing something in the UI that would let me know which of the test runs in the matrix a given annotation is from?

[eoinkelly]

It is nice having the failing test output inline in the diff

[G-Rath]

Am I missing something in the UI that would let me know which of the test runs in the matrix a given annotation is from?

I don't think you can, but that might be improvable with configuration - though also matrixes and annotations have always been a bit lacking in their interaction - namely last I knew they didn't deduplicate annotations but that might have improved; so I think we can probably at least have reports with different names which would make it more obvious, but that might mean getting the same annotation multiple times.

I'll play around with it later this week.