build(ci): try 1.12 with (almost) full stdlib collection in system image

[pankgeorg]

Experiment to benchmark 1.12.2-max (=julia 1.12.2 with 1.10 system image) startup times.

When adding Pkg there, I get

error during bootstrap:
LoadError("sysimg.jl", 64, LoadError("/home/pgeorgakopoulos/julia/usr/share/julia/stdlib/v1.12/Pkg/src/Pkg.jl", 3, LoadError("/home/pgeorgakopoulos/julia/usr/share/julia/stdlib/v1.12/Pkg/src/precompile.jl", 101, Base.IOError("could not spawn `'' a registries/Registry.tar.gz -tgzip registries/Registry.tar`: no such file or directory (ENOENT)", -2))))

When adding MbedTLS, I get an issue about it not being found. I think it's fine.

Difference in size is ~300MB for the usr/lib/julia folder. I'd say that's negligible for the everyday user.

pgeorgakopoulos@georgetta:~/julia$ du usr/lib/julia/ -alh
273M    usr/lib/julia/sys.so
65M     usr/lib/julia/basecompiler-o.a
259M    usr/lib/julia/sysbase.so
402M    usr/lib/julia/sys-o.a
55M     usr/lib/julia/basecompiler.so
379M    usr/lib/julia/sysbase-o.a
1.4G    usr/lib/julia/
pgeorgakopoulos@georgetta:~/julia$ du usr/lib/julia/ -alh
318M    usr/lib/julia/sys.so
65M     usr/lib/julia/basecompiler-o.a
305M    usr/lib/julia/sysbase.so
468M    usr/lib/julia/sys-o.a
55M     usr/lib/julia/basecompiler.so
446M    usr/lib/julia/sysbase-o.a
1.7G    usr/lib/julia/

[giordano]

When adding MbedTLS, I get an issue about it not being found.

Because it's not a stdlib in 1.12

[pankgeorg]

When adding MbedTLS, I get an issue about it not being found.

Because it's not a stdlib in 1.12

The "stdlib" is a concept that eludes me 😅. Does it mean it's not in the default system image? Or that it's not the "default" way to do encryption any more?

Part of the what this PR tries to "prove" as a concept, is that "default system image", "standard libraries" and even "default environment variables" are not "one size fits all" as they can lead to highly diverse experiences and thus I'm trying to collect the data to propose that they should be highly configurable, easily. Which, as a goal, may be beyond julia itself (and into juliaup or even unchartered territory). Let's see what the data will show, I'm still at hypothesis stage🤞🏾

[giordano]

Does it mean it's not in the default system image? Or that it's not the "default" way to do encryption any more?

It means it doesn't exist at all.

[KristofferC]

I pushed a commit with a version of Pkg that includes JuliaLang/Pkg.jl#4518 so it can be included in the sysimage. I will see if I can understand why the REPL hangs.