set container port with env variables

[valentinomariotto]

hey again! with these changes I enabled the container port to be set with an environment variable. I need to be able to set it to 80 for production. Anyway, I was unable to get it to work with the perl module, as you did, so I ended up just replacing the variable with sed in the run it script. Maybe you can do it properly :)

I didn't test the apache container