Add an Artifacts.toml?

[amontoison]

For some research papers with François Pacaud and Sungho Shin, we rely on an Artifacts.toml to easily test our optimization solvers on ACOPF problems. It can be also useful here.
The content of Artifacts.toml is:

[PGLib_opf]
git-tree-sha1 = "0e8968a89b6ad43910a8eda4ec30656add35cf91"
lazy = false
    [[PGLib_opf.download]]
    sha256 = "f1421ce22f0a7b9de8a8b2111776b496348220192ad24aace392c3bf608706c2"
    url = "https://github.com/power-grid-lib/pglib-opf/archive/refs/tags/v23.07.tar.gz"

In our test, we can afterward do:

pglib_path = joinpath(artifact"PGLib_opf", "pglib-opf-23.07")

using PowerModels
pglib_opf_case78484_epigrids = ac_power_model(joinpath(pglib_path, "pglib_opf_case78484_epigrids.m"))

[odow]

There's https://github.com/noahrhodes/PGLib.jl

import PGLib
filter(endswith(".m"), readdir(PGLib.PGLib_opf; join = true))

cc @noahrhodes

[amontoison]

I was not aware of PGLib.jl!
We should maybe use it as a dependency here?
In all cases, a note in the README seems relavant.

[noahrhodes]

I have done very little advertising for it, but it is quite useful for portable benchmarks like this. And as a post-doc now working with LANL, I can garuntee it will be continue to be supported.