[plugin] allow cross compiling to Amazon Linux without docker

[sebsto]

The plugin should add an option allowing developers to cross compile to Amazon Linux, removing the dependency on docker.

This can be done in two ways

1/ check and/or install the Static Linux SDK (musl-based) and create a standalone binary statically linked to musl.
Pro : no SDK bundle to generate
Cons : binary size might impact cold start time

2/ Create our own bundle of the SDK for Amazon Linux. Check or install the SDK at first invocation of the plugin and cross compile for that SDK
Pro : Same binary size as with the existing docker-based solution
Cons : we have to create (and maintain) and Amazon Linux 2 SDK bundle

References:

SDK Bundles : https://github.com/swiftlang/swift-evolution/blob/main/proposals/0387-cross-compilation-destinations.md
Static Linux SDK : https://www.swift.org/documentation/articles/static-linux-getting-started.html
Swift SDK Generator : https://github.com/swiftlang/swift-sdk-generator

What version of this project (swift-aws-lambda-runtime) are you using?

main

Swift version

6.x

[sebsto]

We can build an SDK for AmazonLinux2 with
https://github.com/swiftlang/swift-sdk-generator

swift run swift-sdk-generator make-linux-sdk \
       --with-docker \
       --from-container-image swift:6.0-amazonlinux2 \
       --swift-version 6.0.1-RELEASE 


All done! Install the newly generated SDK with this command:
swift experimental-sdk install /Users/stormacq/Desktop/swift-sdk-generator/Bundles/6.0.1-RELEASE_ubuntu_jammy_aarch64.artifactbundle

After that, use the newly installed SDK when building with this command:
swift build --experimental-swift-sdk 6.0.1-RELEASE_ubuntu_jammy_aarch64

I still need to get rid of Ubuntu :-)

[sebsto]

duplicate of #332