Of course! Bash script is Turing complete so it should be possible to implement everything in it :) The only upside to having an executable Dockerfile is that

Of course! Bash script is Turing complete so it should be possible to implement everything in it :) The only upside to having an executable Dockerfile is that it's still a valid Dockerfile that you can use with docker build, docker-compose, etc. in addition to being able to execute it.