Fix error output on Linux

[sidepelican]

Motivation

On linux, this action makes an error log every time.

example: https://github.com/fwal/setup-swift/actions/runs/1506129234

Integrate Swift 5.5 on ubuntu-latest
Failed to setup requested swift version

I want to calm down the error logs.

Reason

getVersion function anytime returns nullon linux .
The regex searches Apple Swift version.

https://github.com/fwal/setup-swift/blob/a94947b51dc16f23683cbdded9b5313f716b04b9/src/get-version.ts#L32

But the output of swift --verion on Linux does not contains Apple keyword.

macOS:

$ swift --version     
swift-driver version: 1.26.9 Apple Swift version 5.5.1 (swiftlang-1300.0.31.4 clang-1300.0.29.6)
Target: x86_64-apple-macosx12.0

Linux(running on docker for mac):

$ docker run -it --rm swift:5.5 /usr/bin/swift --version
Swift version 5.5.1 (swift-5.5.1-RELEASE)
Target: x86_64-unknown-linux-gnu

How to fixed

just removed Apple keyword from the regex.

[fwal]

Hi @sidepelican and thanks for the PR!

Could we add a test case with the output from linux to avoid any regressions of this in the future? 🙂
You can add it in /__tests__/get-version.test.ts
Then, to fix the linting issues please run npm run format and commit the changes. 👍🏻

[sidepelican]

Thanks for the review!
I add test case and formatted.

[fwal]

Nice! 👍🏻