Or: don't hard-code your demo server port to 8080. Let it choose the next available port instead.

Don't do this or you must go to bed without committing your code.

Containers manage binaries and their supporting libs. Pure Go binaries don't need any external libs. Is the `scratch` image the right choice?

Can multiple goroutines write to the same slice without any safeguard? Sure, they can, but is it a good idea?