Test rebuild requirement on Linux

[Cyberbeni]

Probably lsb_release --codename would work fine instead of uname -v

[Cyberbeni]

When using just swift --version, SwiftLint threw an error on ubuntu-18.04 after loading the cache saved on 20-04: swiftlint: /lib/x86_64-linux-gnu/libm.so.6: version 'GLIBC_2.29' not found (required by swiftlint)

[Cyberbeni]

It's probably the best to wait for official support: https://bugs.swift.org/browse/SR-648?focusedCommentId=59744&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-59744

[Cyberbeni]

https://github.com/tomerd/swift-evolution/blob/072b984882189b0c83bbc82f9472bb03cf84e77b/proposals/NNNN-static-link-runtime-libraries-by-default-on-supported-platforms.md

[Cyberbeni]

This will probably also allow doing the same on a Linux host: https://developer.apple.com/videos/play/wwdc2024/10136/?time=457

[Cyberbeni]

The static linux sdk needs to be part of the runner image first: https://github.com/actions/runner-images/blob/main/images/ubuntu/scripts/build/install-swift.sh

[Cyberbeni]

This needs to be an option. Lower cache size is probably more important than rebuilding frequency.