dir2config: add version

cmd/dkl-dir2config/render-context.go

@@ -185,6 +185,8 @@ func (ctx *renderContext) renderConfigTo(buf io.Writer, configTemplate *clusters
 		return hex.EncodeToString(ba[:])
 	}
 
+	extraFuncs["version"] = func() string { return Version }
+
 	if err := configTemplate.Execute(ctxName, "config", buf, ctxMap, extraFuncs); err != nil {
 		log.Fatalf("failed to render config %q for host %q: %v", ctx.Host.Config, ctx.Host.Name, err)
 	}