add flag for godotenv

cmd/systemdesigngame/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"github.com/joho/godotenv"
 	"html/template"
 	"net/http"
@@ -11,11 +12,16 @@ import (
 )
 
 func main() {
-	err := godotenv.Load()
+	devMode := flag.Bool("dev", false, "load .env (local dev)")
-	if err != nil {
+	flag.Parse()
+
+	if *devMode {
+		if err := godotenv.Load(); err != nil {
 			panic("failed to load .env")
 		}
 
+	}
+
 	// set up JWT secret used for authentication
 	auth.JwtSecret = []byte(os.Getenv("JWT_SECRET"))
 	tmpl := template.Must(template.ParseGlob("static/*.html"))