Compile custom julia sysimage

[davidanthoff]

Once #595 is merged and we have some experience with it, we should investigate whether we can use PackageCompiler.jl during the build step to compile a custom sysimage that includes all the packages in the Project.toml. That custom sysimage would then be stored in the docker file. This has the potentially to make things a lot more snappy because we could probably get around a fair bit of JIT compiling.

[NHDaly]

woahhhhh that'd be super duper cool! :D I love it.

[asinghvi17]

Beware of issues that can arise due to this, though - Makie, for example, will not show a plot display unless AbstractPlotting.__init__() is called first (because of weirdness around the display stack). There might be other examples of this behaviour that you'd have to watch out for.

[davidanthoff]

Yes, we should probably wait until this whole stack is more mature on the julia side of things. I think we can really only consider using it when PackageCompiler.jl is at a point where "it just works", not matter what.