Update Data Plane Config via Agent

[mpstefan]

As a user of NGF
I want NGF to update NGINX's configuration without it being deployed on the same pod as the control plane
So that NGF is more secure against potential attacks
And so that NGF can scale independently and more efficiently.

Acceptance

• Configuration generated by the control plane is applied to all data plane pods.

Dependencies

• Connect Agent to Control Plane #2851