Allow create extra objects and use envFrom referencing secret(s)/configmap(s)

[rubroboletus]

What would you like to be added:

Allow create extra objects in manifest like secret / configmap containing additional configuration to be used in environment settings and use envFrom referencing configmap(s) / secret(s)

Why is this needed:

In our environment, we need to use proxy with authentication credentials and do not wanna to expose them directly in daemonset manifest, but keep them in secret.