Generalize arch and Julia version testing in CI #4

julia> using JuliaAstroDocs

julia> packages = filter(x -> occursin("JuliaAstro", x.repo), JuliaAstroDocs.ecosystem_t());

julia> for (name, repo) in zip(packages.name, packages.repo)
           println("- [ ] [", name, "](", repo, ")")
       end

julia> sort!(packages; by = x -> x.name);