- fix container name
- the volume-from label works only with "same-pod" label of course. It
allows the use of the same volume from another service to be shared in
a same pod. E.g. php-fpm + nginx
- variables are all in values.yaml as "template string". This means that
we can now set values to reference others (useful with mapenv label)
- we can also set any variable as a secret
- that means that katenary.io/env-to-service is now DEPRECATED
- the yaml style in label is OK, that allows more possibilities and
adaptation for users
