We have a fair amount of shell scripts in our repositories and would benefit from uniform formatting. [shfmt](https://github.com/mvdan/sh) is a popular choice but it's worth researching alternatives first. **Tasks** - Add a `make format-shell` to format shell scripts - Add a pre-commit hook for similar functionality, such as [pre-commit-shfmt](https://github.com/scop/pre-commit-shfmt)