Create an ISO image from the contents of a directory

hdiutil

Utility to create and manage disk images.
More information: <https://ss64.com/osx/hdiutil.html>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

hdiutil makehybrid -o {{path/to/output_file}} {{path/to/directory}}

click the source code to copy