build: Remove noisy build messages (#826)

By switching the way that make assigns variables, the shell calls to
determine the snapshot image version will only be called when necessary,
rather than when parsing the Makefile. This cleans up noisy build
messages,
which do not break the build but are noisy.

Author: jimmidyson

make/dev.mk

@@ -7,7 +7,7 @@ dev.run-on-kind: kind.create clusterctl.init
 ifndef SKIP_BUILD
 dev.run-on-kind: release-snapshot
 endif
-dev.run-on-kind: SNAPSHOT_VERSION := $(shell gojq -r '.version+"-"+.runtime.goarch' dist/metadata.json)
+dev.run-on-kind: SNAPSHOT_VERSION = $(shell gojq -r '.version+"-"+.runtime.goarch' dist/metadata.json)
 dev.run-on-kind:
 	kind load docker-image --name $(KIND_CLUSTER_NAME) \
 		ko.local/cluster-api-runtime-extensions-nutanix:$(SNAPSHOT_VERSION) \
@@ -27,7 +27,7 @@ dev.update-webhook-image-on-kind: export KUBECONFIG := $(KIND_KUBECONFIG)
 ifndef SKIP_BUILD
 dev.update-webhook-image-on-kind: release-snapshot
 endif
-dev.update-webhook-image-on-kind: SNAPSHOT_VERSION := $(shell gojq -r '.version+"-"+.runtime.goarch' dist/metadata.json)
+dev.update-webhook-image-on-kind: SNAPSHOT_VERSION = $(shell gojq -r '.version+"-"+.runtime.goarch' dist/metadata.json)
 dev.update-webhook-image-on-kind:
 	kind load docker-image --name $(KIND_CLUSTER_NAME) \
 	  ko.local/cluster-api-runtime-extensions-nutanix:$(SNAPSHOT_VERSION)