### Description
Given all the shell files that now exist in the repo, would be nice to
have linting/formatting around them (in addition to the existing
shellcheck which doesn't do anything to format the shell code). This PR
introduces `shfmt` to both check for changes and apply formatting when
the associated make targets are called.
Added Amazon Linux 2 setup script. Also updated Ubuntu setup script to keep the scripts as aligned as possible.
Co-authored-by: cragwolfe <crag@unstructured.io>