docs: Add in documentation

README.md

@@ -9,11 +9,14 @@ The following environment variables can be set:
 
 Name | description | default 
 --- | --- | --- 
+DOCKER_CERTIFICATE_SECRET | You **must** provide a certificate to enable TLS between the docker daemon and the registry and create a secret from it, this variable is the name of the secret | None
 NAMESPACE | The namespace in which the resources should be created. This should be the same namespace as where the container is running | default 
 SECONDS_BETWEEN_STREAMS | Time to sleep between calls to the API. The operator will occasionally lose connection or else fail to run if the Custom Resource Definition does not exist. | 30
 HOSTESS_DOCKER_REGISTRY | The docker registry where mirror-hostess is to be pulled from. | docker.io 
 HOSTESS_DOCKER_IMAGE | The name of the docker image for mirror-hostess. | ocadotechnology/mirror-hostess
 HOSTESS_DOCKER_TAG | The tag for the mirror-hostess docker image. | 1.1.0
+IMAGE_PULL_SECRETS | (Optional) Secret to pull images from the upstream registry | None
+CA_CERTIFICATE_BUNDLE | (Optional) Certificate bundle for the registry host  | None
 
 ## Usage
 In order to have the operator deploy a new mirror, the cluster needs to have the custom resource defined: