Add support for watchOS to the podspecs

[daltonclaybrook]

grpc-swift is able to support watchOS 6+ with NIO Transport Services and Network.framework, but the podspecs do not declare such support, so it cannot be used in a watchOS app through CocoaPods. This PR adds the necessary support to each of the three podspecs.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Dalton Claybrook (2bb0d90, 1110790)

[glbrntt]

Thanks for the PR @daltonclaybrook -- the podspecs are generated by /scripts/build_podspecs.py, would you mind updating the script instead?

Also, I'm curious, have you actually tried gRPC on watchOS? It's something I've been meaning to do but haven't yet found the time for.

[daltonclaybrook]

@glbrntt I'd be happy to do that.

have you actually tried gRPC on watchOS?

Yes! It works really well and I've been super pleased with it. This was the crucial step for me to get it working. Though, it seems I may have one final hurdle getting grpc-swift to rebuild from Bitcode on watchOS. I've created #999 to track this issue. If you have any thoughts or suggestions on this, I would be immensely grateful.

[daltonclaybrook]

@glbrntt good for another look

[glbrntt]

Thanks @daltonclaybrook!

I just filed PRs for the various NIO components to make sure they also have watchOS deployment targets:

• Add watchOS deployment to PodSpec build script apple/swift-nio#1679
• Add watchOS deployment to PodSpec build script apple/swift-nio-http2#251
• Add watchOS deployment to PodSpec build script apple/swift-nio-ssl#252
• Add watchOS deployment to PodSpec build script apple/swift-nio-transport-services#107

It looks like SwiftLog and SwiftProtobuf are already good to go. I'll wait for the above to be merged before merging this PR.

[glbrntt]

have you actually tried gRPC on watchOS?

Yes! It works really well and I've been super pleased with it.

That's great to hear!

This was the crucial step for me to get it working. Though, it seems I may have one final hurdle getting grpc-swift to rebuild from Bitcode on watchOS. I've created #999 to track this issue. If you have any thoughts or suggestions on this, I would be immensely grateful.

I'm afraid not but it seems like you and @Lukasa have made progress on this.