Add build flag for production UI dist output embed.

ui/embed.go

@@ -0,0 +1,19 @@
+package ui
+
+import (
+	"embed"
+	"io/fs"
+)
+
+//go:embed dist
+var embedUI embed.FS
+
+/// GetUIFS returns an embed FS for the UI components in the dist dir.
+func GetUIFS() fs.FS {
+	f, err := fs.Sub(embedUI, "build")
+	if err != nil {
+		panic(err)
+	}
+
+	return f
+}