Because your Makefile likely depends on a very particular environment setup with specific versions of compilers, script hosts, tools, etc. You can meticulously

Because your Makefile likely depends on a very particular environment setup with specific versions of compilers, script hosts, tools, etc. You can meticulously maintain a giant readme that tells devs how to set each tool up (and inevitably takes everyone days and weeks of time to troubleshoot), or you can make a container that has everything setup and ready to go. Make is great and you'd likely use it inside the container. But everything around make is typically an enormous pain to manage across multiple machines, multiple architectures, etc. and that's where docker containers help greatly.