Comment by Ajedi32

Running the same script every time doesn't necessarily guarantee the same result.

Lots of docker build scripts have the equivalent of

  date > file.txt

or

  curl https://www.random.org/integers/?num=1&min=1&max=1000&col=1&base=10&format=plain&rnd=new > file.txt

Buried deep somewhere in the code.

But yeah I don't see any reason why you couldn't theoretically make a reproducible build with Docker.