chore(makefile): use CLUSTER_CLIENT instead of oc (#676)

Signed-off-by: Thuan Vo <[email protected]>

Makefile

@@ -96,7 +96,7 @@ CUSTOM_SCORECARD_VERSION ?= 2.5.0-$(shell date -u '+%Y%m%d%H%M%S')
 export CUSTOM_SCORECARD_IMG ?= $(IMAGE_TAG_BASE)-scorecard:$(CUSTOM_SCORECARD_VERSION)
 
 DEPLOY_NAMESPACE ?= cryostat-operator-system
-TARGET_NAMESPACES ?= $(DEPLOY_NAMESPACE)
+TARGET_NAMESPACES ?= $(DEPLOY_NAMESPACE) # A space-separated list of target namespaces
 SCORECARD_NAMESPACE ?= cryostat-operator-scorecard
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
@@ -499,7 +499,7 @@ create_clustercryostat_cr: destroy_clustercryostat_cr ## Create a cluster-wide C
 	target_ns_json=$$(jq -nc '$$ARGS.positional' --args -- $(TARGET_NAMESPACES)) && \
 	$(CLUSTER_CLIENT) patch -f config/samples/operator_v1beta1_clustercryostat.yaml --local=true --type=merge \
 	-p "{\"spec\": {\"installNamespace\": \"$(DEPLOY_NAMESPACE)\", \"targetNamespaces\": $$target_ns_json}}" -o yaml | \
-	oc apply -f -
+	$(CLUSTER_CLIENT) apply -f -
 
 .PHONY: destroy_cryostat_cr
 destroy_cryostat_cr: ## Delete a namespaced Cryostat instance.