fix: include martens yq and revert the additional target

Makefile

@@ -5,7 +5,7 @@ RESOURCE_YAML := ${CHART_DIR}/templates/resource.yaml
 
 CHART_REPO := gs://jenkinsxio/charts
 
-prep:
+fetch:
 	rm -f ${CHART_DIR}/templates/*.yaml
 	mkdir -p ${CHART_DIR}/templates
 ifeq ($(CHART_VERSION),latest)
@@ -31,10 +31,8 @@ endif
 	rm -f ${RESOURCE_YAML} args.yaml
   # Copy src templates
 	cp src/templates/* ${CHART_DIR}/templates
-
-fetch: prep
   # Set value in Chart.yaml
-	yq eval -i '.appVersion = "$(shell yq eval '.data.version | sub("v"; "")' ${CHART_DIR}/templates/dashboard-info-cm.yaml)"' ${CHART_DIR}/Chart.yaml
+	yq eval -i '.appVersion = (load("$(CHART_DIR)/templates/dashboard-info-cm.yaml").data.version | sub("v"; ""))' ${CHART_DIR}/Chart.yaml
 
 build:
 	rm -rf Chart.lock