How to create a Dockerfile with a combined dev and prod environment?

I try to dockerize a Next.js app with a combined image for dev and prod.

How to create a Dockerfile with dev and prod?

I try to dockerize a Next.js app with a combined image for dev and prod.

Dockerfile with dev and prod

I try to dockerize a Next.js app with a combined image for dev and prod.

dockerfile with dev en prod

I try to dockerize a nextjs app with a combinend image for dev and prod.

Dockerfile on run sh:next not found

I try to build docker with optimization, but when I try to to run it, it says
sh: next:not found