How do I mount packaged UE4 games into a bootable CD?
Do you want it to run straight from the CD or are you looking to create an installer exe?
You can’t out of it self, you need OS to run it so you need to use some CD bootable OS and just include your game in it. There may solutions, but the best one (and legal one for public distribution, since you can’t just use Windows) is some Linux livecd solution if oyu one any that allows customization. In that case you will need to package your game for Linux, you will also need to equip your live cd with all decencies that UE4 needs.
If you just looking for CD autorun (on Windows) you need to setup autorun.inf:
If you looking for making installer… there lot of software solutions that let you make those, just google.