dir2config: add version

cmd/dkl-dir2config/main.go

@@ -16,6 +16,8 @@ import (
 	"novit.tech/direktil/local-server/pkg/clustersconfig"
 )
 
+var Version = "dev"
+
 var (
 	Debug = false
 
@@ -124,6 +126,8 @@ func main() {
 
 	defer out.Close()
 
+	out.Write([]byte("# dkl-dir2config " + Version + "\n"))
+
 	if err = yaml.NewEncoder(out).Encode(dst); err != nil {
 		log.Fatal("failed to render output: ", err)
 	}

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)
 	}