Add test JLL

Author: vchuravy

test/LAMMPS_jll/.pkg/platform_augmentation.jl

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+using Base.BinaryPlatforms
+
+const LAMMPS_UUID = Base.UUID("5b3ab26d-9607-527c-88ea-8fe5ba57cafe")
+# Can't use Preferences since we might be running this very early with a non-existing Manifest
+const abi = get(Base.get_preferences(LAMMPS_UUID), "abi", Sys.iswindows() ? "microsoftmpi" : "mpich")
+
+function augment_platform!(platform)
+    if !haskey(platform, "mpi")
+        platform["mpi"] = abi
+    end
+    return platform
+end

test/LAMMPS_jll/.pkg/select_artifacts.jl

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+# Note: This file is executed from `Pkg` in an isolated environment.
+# Warn: Since this is executed in a sandbox, the current preferences are not
+#       propagated and thus no decision can be made based on them.
+#       Use LazyArtifacts in this case.
+#       Fixed in https://github.com/JuliaLang/Pkg.jl/pull/2920
+
+using TOML, Artifacts, Base.BinaryPlatforms
+include("./platform_augmentation.jl")
+artifacts_toml = joinpath(dirname(@__DIR__), "Artifacts.toml")
+
+# Get "target triplet" from ARGS, if given (defaulting to the host triplet otherwise)
+target_triplet = get(ARGS, 1, Base.BinaryPlatforms.host_triplet())
+
+# Augment this platform object with any special tags we require
+platform = augment_platform!(HostPlatform(parse(Platform, target_triplet)))
+
+# Select all downloadable artifacts that match that platform
+artifacts = select_downloadable_artifacts(artifacts_toml; platform, include_lazy = true)
+
+#Output the result to `stdout` as a TOML dictionary
+TOML.print(stdout, artifacts)