Container enhancement

[codecov-io]

Current coverage is 97.01%

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[erikap]

@cecton: it's not intended to include the mu.semte.ch stack in each template. We already have mu-project to bootstrap a mu.semte.ch project. This repository should just have a dockerized template which can be easily extend by users to build a custom microservice. Have a look at mu-ruby-template as an example.

[cecton]

Okay thanks. The idea here was to give a fully working example... but it's true it's a bit too much for a template repository. You have a reference to a host "database" in the Dockerfile of mu-ruby-template but it's not defined anywhere.