docker: Build with Alpine Linux

[andy5995]

For #50

[skip ci]

This image will build, but swift is not available

[SR-4632] Swift on Alpine Linux (support musl libc) swiftlang/swift#47209

Image sizes:

This is 1.1GB, the Debian image is currently 3.83

This PR can be closed and use for future use.

[KaruroChori]

That would be very bad. Supporting musl libc is not really negotiable, but my understanding was that Swift 6 was capable.
I need to investigate this more in depth.

[andy5995]

When this ran, I got the error that the operating system was unsupported.

[KaruroChori]

musl support is an open issue under certain conditions, but that looks like more of an arbitrary restriction of the installer script. I need to test it in a real env.

[KaruroChori]

I get it. Swift can crosscompile to support musl and so alpine as target. It cannot run on it yet.

[andy5995]

Ok. For reference: Building from source or the options above it. That could be done in the Dockerfile.

[KaruroChori]

For the time being I would suggest we stop working on alpine for docker.
I need the project to evolve a bit more and see if swift brings some added value, if it is better to move it out with its own components in a separate repo, or if it should be nuked entirely (except for its module files which are provided to make c libraries compatible with it).

Support of alpine as a target is much more important than supporting swift as a language within this repo. Still, building directly on alpine is less of a strict requirement, as long as vs runs on it.