Add .spi.yml for Swift Package Index DocC support

[slashmo]

@yim-lee I just checked, with this SPI configuration when you click on "Documentation" on the SPI website it takes you to the Instrumentation documentation instead of Tracing without any UI to switch to the Tracing documentation. Changing the path works, but IMHO we should definitely optimize for folks seeing the Tracing documentation first. I don't know if it's enough to flip the order of the documentation_targets array to do so.

[yim-lee]

@finestructure Please see slashmo's comment above. Is there a way for us to specify the "landing" target?

[finestructure]

That's down to the order - we're landing on the first target in the list IIRC!

[finestructure]

I can manually trigger a doc re-build out of turn to verify without waiting for the 24 cooldown, just let me know.

[yim-lee]

That's down to the order - we're landing on the first target in the list IIRC!

Oh great! Thanks for the quick response @finestructure!

[yim-lee]

@slashmo - opened https://github.com/apple/swift-distributed-tracing/pull/74

[yim-lee]

@finestructure Can you please trigger a rebuild? Thanks in advance! 🙏

[finestructure]

That's rebuilt with revision e8e428b6db9d2b1a4675feb5dbfbd947a7b5bc1c

[finestructure]

Ok, both are there, got confused by our own UX there for a sec and couldn't find the target switcher 😅🤔

[yim-lee]

Thanks @finestructure. You are awesome!

[ktoso]

Great, thanks everyone!