Can't run tests in repos that have Zig submodules

[ziontee113]

Steps To Reproduce

1. zig init
2. git init
3. mkdir submodules
4. git submodule add https://github.com/ziglibs/treez.git submodules/treez
5. Try to run test in main.zig

Current behavior

Can't run tests in repos that have Zig submodules.

My temporary fix

In neotest-zig/init.lua -> function M._build_spec_with_buildfile(args, build_file_path), right after declaration of build_file_dir_path variable:

    if string.find(build_file_dir_path, "\n") then
        local lines = {}
        for s in build_file_dir_path:gmatch("[^\r\n]+") do
            table.insert(lines, s)
            break
        end
        build_file_dir_path = lines[1]
        log.info("DEBUGGING new build_file_dir_path", build_file_dir_path)
    end

It seems like the Lua pattern didn't account for submodules shenanigans. In my case, before the fix, build_file_dir_path was very messed up and had multiple \n characters in it, so I tried the fix and everything works as normal.

[lawrence-laz]

Let me know if #25 works ok for you

[lawrence-laz]

Thanks for quality reports!