Makefile, samples: minor cleanup/fixes

- remove the Extension CR sample (we recently removed that entire API
  and controller from the project)
- in the ClusterExtension CR sample, add .spec.installNamespace (we
  recently added that as a required field)
- In the Makefile, allow KIND_CLUSTER_VERSION to be provided from the
  environment

Signed-off-by: Joe Lanford <joe.lanford@gmail.com>

Makefile

@@ -36,7 +36,10 @@ endif
 # bingo manages consistent tooling versions for things like kind, kustomize, etc.
 include .bingo/Variables.mk
 
+ifeq ($(origin KIND_CLUSTER_NAME), undefined)
 KIND_CLUSTER_NAME := operator-controller
+endif
+
 # Not guaranteed to have patch releases available and node image tags are full versions (i.e v1.28.0 - no v1.28, v1.29, etc.)
 # The KIND_NODE_VERSION is set by getting the version of the k8s.io/client-go dependency from the go.mod
 # and sets major version to "1" and the patch version to "0". For example, a client-go version of v0.28.5

config/samples/olm_v1alpha1_clusterextension.yaml

@@ -3,5 +3,6 @@ kind: ClusterExtension
 metadata:
   name: clusterextension-sample
 spec:
+  installNamespace: default
   packageName: argocd-operator
   version: 0.6.0