[Feature request?] Support for lsfg-vk

Hi. I've been running `conty` for a while now and it's truly a wonderful tool. Recently, and after messing around with `lsfg-vk` ([repo](https://github.com/PancakeTAS/lsfg-vk)) on a machine with native `steam`, `wine` and `vulkan` installed, I wanted to try setting it up on a different machine relying only on `conty`'s libraries (so no system vulkan installed). Since conty's Steam already stores all game files on the host's `$HOME/.steam` (for the `Lossless.dll` requirement), at first I thought simply installing `lsfg-vk` through pacman/yay on the host linux and then passing the env vars through `conty` to run the desired program would work, but apparently it doesn't. So, after setting everything up, if I run `LSFG_BENCHMARK=2560x1440 ./conty.sh vkcube` the terminal output is exactly the same as running just `./conty.sh vkcube`, without the extra lines for lsfg-vk as shown on the [lsfg-vk wiki](https://github.com/PancakeTAS/lsfg-vk/wiki/Using-lsfg%E2%80%90vk's-integrated-benchmark). Looking at the release files for `lsfg-vk` it looks like it adds an extra lib and a vulkan layer which tries to integrate with the system's vulkan installation, but since conty is containerized... I guess the only way to make it work is creating my own conty executable; which I'll try next. Still, since this is a package that's been relatively popular for several months now, have you considered adding it to conty by default?