makefile: allow override KUBECTL_CMD

When (developer is) running over OpenShift cluster it is typical to use
the OpenShift Client CLI (oc[1]) utility instead of kubectl. Allow her
to override Makefile's KUBECTL_CMD.

[1] https://github.com/openshift/oc

Signed-off-by: Shachar Sharon <[email protected]>

Author: synarete

Makefile

@@ -29,7 +29,7 @@ endif
 
 GO_CMD:=go
 GOFMT_CMD:=gofmt
-KUBECTL_CMD:=kubectl
+KUBECTL_CMD?=kubectl
 BUILDAH_CMD:=buildah
 YAMLLINT_CMD:=yamllint
 

devel.mk.sample

@@ -7,6 +7,9 @@ VERSION=0.0.1
 # Run in developer mode
 DEVELOPER=1
 
+# Use OpenShift's Client CLI
+# KUBECTL_CMD=oc
+
 # Image URL to use all building/pushing image targets
 TAG=latest
 IMG=quay.io/quayusername/samba-operator:$(TAG)