Debugging a weird 'file not found' error

Yesterday I ran into a weird error where I ran a program and got the error “file not found” even though the program I was running existed. It’s something I’ve run into before, but every time I’m very surprised and confused by it (what do you MEAN file not found, the file is RIGHT THERE???!!??) So let’s talk about what happened and why! the error Let’s start by showing the error message I got. I had a Go program called serve.go, and I was trying to bundle it into a Docker container with this Dock...