Add formatting jsonnet to generate make target

examples/prometheus-name-override.jsonnet

@@ -1,9 +1,9 @@
-((import "kube-prometheus/kube-prometheus.libsonnet") + {
-	prometheus+: {
-		prometheus+: {
-			metadata+: {
-				name: "my-name",
-			}
-		}
-	}
-}).prometheus.prometheus
+((import 'kube-prometheus/kube-prometheus.libsonnet') + {
+   prometheus+: {
+     prometheus+: {
+       metadata+: {
+         name: 'my-name',
+       },
+     },
+   },
+ }).prometheus.prometheus