[ADD] docker file and shippable compatibility

Docker odoo image
Building here
[ocaimages/oca-odoo](https://registry.hub.docker.com/u/ocaimages/oca-odoo/builds_history/91750/)
I think @bwrsandman mean to replace update-locale by ENV

Something like (not sure what you need with fr_FR)

RUN printf 'fr_FR\nen_US.UTF-8 UTF-8\n' >> /etc/locale.gen && \
  locale-gen
ENV LANG en_US.UTF-8  
ENV LANGUAGE en_US:UTF-8
ENV LC_ALL en_US.UTF-8 

Taken partially from http://jaredmarkell.com/docker-and-locales/