Update .env example file

Author: aledbf

.env.example

@@ -19,10 +19,13 @@ ROUTE53_ZONEID=XXXXXXXXX
 # If there is no value we create a new bucket with the name "container-registry-<cluster name>-<account ID>"
 CONTAINER_REGISTRY_BUCKET=
 
-# Configure the secret name containing the credentials to pull images from private container registries.
-# Please do not forget to create the secret!!!
+# The path to the file containing the credentials to pull images from private container registries.
 # https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
-IMAGE_PULL_SECRET=
+IMAGE_PULL_SECRET_FILE=
+
+# List of registries (hostnames) that users get access to by default allowed to be used in base images.
+# Default: only images from docker.io
+IMAGE_REGISTRY_WHITELIST=
 
 # Allow to define internal or internet-facing ALB for gitpod proxy component.
 # https://kubernetes-sigs.github.io/aws-load-balancer-controller/v2.2/guide/ingress/annotations/#scheme