For a specific deployment we may need to run a specific management
command, like the one added previously updating all files content-type.
A template is added responsible to manage this case. The job will be
created only if the backend.job.command is set.
This is a revert of 1da5a removing actual deployments and keeping
only the dev environment in Tilt.
The clean-up was a bit heavy handed. We should keep the Helm
chart to the development repository and move away only the
deployment configuration.
