update head to use beta iso

Makefile

@@ -14,7 +14,7 @@
 
 # Bump these on release - and please check ISO_VERSION for correctness.
 VERSION_MAJOR ?= 1
-VERSION_MINOR ?= 11
+VERSION_MINOR ?= 12
 VERSION_BUILD ?= 0
 RAW_VERSION=$(VERSION_MAJOR).$(VERSION_MINOR).$(VERSION_BUILD)
 VERSION ?= v$(RAW_VERSION)
@@ -23,7 +23,7 @@ KUBERNETES_VERSION ?= $(shell egrep "DefaultKubernetesVersion =" pkg/minikube/co
 KIC_VERSION ?= $(shell egrep "Version =" pkg/drivers/kic/types.go | cut -d \" -f2)
 
 # Default to .0 for higher cache hit rates, as build increments typically don't require new ISO versions
-ISO_VERSION ?= v$(VERSION_MAJOR).$(VERSION_MINOR).0
+ISO_VERSION ?= v$(VERSION_MAJOR).$(VERSION_MINOR).0-beta.0
 # Dashes are valid in semver, but not Linux packaging. Use ~ to delimit alpha/beta
 DEB_VERSION ?= $(subst -,~,$(RAW_VERSION))
 RPM_VERSION ?= $(DEB_VERSION)