feat(swift5): allow to swift build in linux

[gierschv]

This PR adds the import of FoundationNetworking to the swift 5 templates so we can build the generated code in linux machines & CI.

I noticed that Alamofire recently released to added the linux as well, so it's great to be able to test in our linux CI if the generated code actually builds and has no syntax error (that happens sometimes).

docker run --rm -v $(pwd):/app -it swift:5.7-jammy bash -c "cd /app/samples/client/petstore/swift5/alamofireLibrary && swift build"

[...]
Build complete! (16.33s)

I'm not sure if this project have any Linux CI process to test the generated code, but we could add those swift build if any

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[wing328]

@gierschv thanks for the PR. I wonder if you've time to setup a github workflow to test the Swift 5 petstore sample(s) similar to .github/workflows/samples-php8.yaml

This can help ensure the swift client built on linux as well as part of this PR.

[gierschv]

@wing328 Sure, done!

I tried adding the CI for the other samples on OSX, but ran into some issues importing CoreServices and stuff around mime types (e.g. UTTypeCreatePreferredIdentifierForTag in URLSessionImplementations.swift) that seems to be proprietary on OSX/iOS - and looks like they need to have probably XCode installed. This code looks also a bit deprecated since iOS 15, but the new replacing code had the same build issue without XCode.

I ended up only sticking with adding AlamoFire in the CI that have the platform support for Linux.

[gierschv]

@wing328 I think we are good to merge. The swift5 samples are now built on OSX + swift5/alamofireLibrary that is also built on ubuntu: https://github.com/OpenAPITools/openapi-generator/actions/runs/5794631894?pr=15060

Except swift5/vaporLibrary that I didn't put in the CI config for now as this doesn't even swift build for me on my macbook (on master or on this PR). That could be for another PR to fix this client implementation later if needed.

[wing328]

Agreed that issue has nothing to do with this PR.

Thanks for the PR, which has been merged.

Have a nice weekend.