Linux Support Patch

[coffee-dan]

env searches for where ruby was installed to instead of assuming it is in the same place on all *nixes

Based on feedback given on my draft git-game version bump. Homebrew/homebrew-core#130933 (comment)

Tested using the official Homebrew Linux docker container:

• Install Docker Desktop, and the Docker CLI

docker run --interactive --tty --rm --pull always homebrew/ubuntu22.04:latest /bin/bash
git clone https://github.com/jsomers/git-game.git
cd git-game
git checkout dgr/linux-support-patch
sudo cp git-game /usr/local/bin
sudo apt-get update
sudo apt-get install ruby
git game help