Drop usage of separate containers with envsubst and copy-datadir

[edevosc2c]

The usage of separate containers with envsubst and copy-datadir makes the development difficult, as sometimes the new files are not updated. We are trying to like in Kubernetes (init containers) but we are not in Kubernetes.

I think we should include envsubst only in the concerned containers: security-proxy, datafeeder and ogc-api-records. And execute this initialization in the containers.

We should think about the Kubernetes usage too.

[edevosc2c]

List components that must use envsubst

Think about the fact that kubernetes already have an initcontainer for envsubst. double execution?