Set -e in bump-nightly script

Co-authored-by: Mikayla <mikayla@zed.dev>

script/bump-nightly

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 branch=$(git rev-parse --abbrev-ref HEAD)
 if [ "$branch" != "main" ]; then
   echo "You must be on main to run this script"