fix: helm-charts in overlay only

weird issues with kustomize not being able to merge helm-charts between
base/overlays

- move the helm-charts to the overlay only

Makefile

@@ -4,7 +4,7 @@
 # Usage: make build clusters/au-syd1/bootstrap
 build:
 	@mkdir -p manifests/$(filter-out $@,$(MAKECMDGOALS))
-	@kustomize build $(filter-out $@,$(MAKECMDGOALS)) --output manifests/$(filter-out $@,$(MAKECMDGOALS))
+	@kustomize build --enable-helm $(filter-out $@,$(MAKECMDGOALS)) --output manifests/$(filter-out $@,$(MAKECMDGOALS))
 
 # Clean all generated manifests
 clean:
@@ -12,4 +12,4 @@ clean:
 
 # Allow any argument after build to be treated as a path
 %:
-	@:
+	@: