Add autobackup-operator local docker registry

The autobackup-operator project needs a place to push its container
image in the artifactapi local docker registry during CI releases.

Add config/local_docker/autobackup-operator.yaml declaring the local
docker repo (description only, matching sibling convention).

config/local_docker/autobackup-operator.yaml

@@ -0,0 +1 @@
+description: "Local container image registry for the autobackup-operator image"

config/remote_helm/k8up.yaml

@@ -1,7 +0,0 @@
-base_url: https://k8up-io.github.io/k8up
-description: K8up backup operator Helm charts
-immutable_ttl: 0
-mutable_ttl: 3600
-check_mutable: true
-immutable_patterns:
-  - "\\.tgz$"

config/virtual/helm.yaml

@@ -10,7 +10,6 @@ members:
   - hashicorp-helm
   - intel-helm
   - jetstack
-  - k8up
   - purelb
   - rancher-stable
   - stakater