Lint rule for ensuring set -euo pipefail or similar is set

[a-frantz]

Upgrading discussion #60 to an issue for visibility.

Repeating myself, but I would think there's an "off the shelf" solution we can pull for this. It might involve shelling out, but I think that would be ok. I just don't want us to get in the business of writing a Bash parser 😬

[a-frantz]

I would rank this as a lower priority than #191 and implementing shellcheck might provide a simple solution to this. So this should probably take a backseat until we get shellcheck incorporated.