It seems that "json" annotation fails to get dashed names (like
configmap-files). That means that all labels in katernay.yaml file
couldn't be parsed.
Using `yaml` annotaiton fixes the problem. Fixes#144.
This labels allow to use some environment variables from another service
and use the configMap / secret instead of the original value. This is
useful to avoid duplication of values for several variables.
This volumes are "emptyDir" and can have init command. For example, in a
"same-pod", it allow the user to copy data from image to a directory
that is mounted on others pods.
