disable interactive mode

- disable interactive mode to simplify installation using CM tools.
Merge branch 'failshell-allow-custom-listen'
Merge pull request #49 from failshell/interactive

disable interactive mode
centos tags were changed, weak
Setup docker container to be configureable by ENV

Fixes most of https://github.com/palourde/uchiwa/issues/22

Just needs docs tweaking to have the right username +
a trusted build setting up.