Add subshells to scripts

[hernandezc1]

Closes #240. Updates ZTF deployment scripts to address changes in #253

[troyraen]

Thanks for this, it will be very helpful! Can I ask you to make the directory reorg a separate PR? Since that one will touch a whole lot of files but will only rename them and not change the contents, making it separate will make things easier to review and to understand in the future when looking at the commit history. Here's how you can do that:

git switch develop
git pull
git switch -c u/ch/ztf/reorg  # or whatever you want to call the branch
git cherry-pick 007f27b
git push

Then open a new PR for that branch. Merge the new PR before merging this one. We ought to be able to do it quickly -- request my review and I'll make it a priority to look at. After that, I don't think that having commit 007f27b still in this PR will cause any problems, but if it does then I'll show you how to remove it.