Implement File Provider

[danehans]

Currently, the EnvoyProxy API defines a File provider. This provider should be implemented or removed.

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[lizj3624]

+1

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[arkodg]

Jotting down some thoughts here
Today, EG provides a top level field called Provider

gateway/api/config/v1alpha1/envoygateway_types.go

Line 43 in 2bf9607

Provider *EnvoyGatewayProvider `json:"provider,omitempty"`

and supports Kubernetes as a provider.
The provider noun could be broken down into two parts

• Config Provider - which provides input config (from a file, kubernetes)
• Infra Provider - which provides an infrastructure to deploy the output resources (envoyproxy fleet) in

So by default we support

provider:
  type: Kubernetes
  kubernetes:
   ....

We can add support for custom Provider type

provider:
  type: Custom
  custom:
    config:
      type: File
      file:
      ....
    infrastructure:
      type: Docker
      docker:
      .... 

[arkodg]

cc @cpakulski

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[Xunzhuo]

Track on #1393