Add environment variable to specify custom UI path

When using SERVE_UI=1

Dockerfile

@@ -85,6 +85,7 @@ ENV PHOTOVIEW_LISTEN_IP 127.0.0.1
 ENV PHOTOVIEW_LISTEN_PORT 80
 
 ENV PHOTOVIEW_SERVE_UI 1
+ENV PHOTOVIEW_UI_PATH /ui
 
 EXPOSE 80
 

api/server.go

@@ -103,7 +103,7 @@ func main() {
 	shouldServeUI := utils.ShouldServeUI()
 
 	if shouldServeUI {
-		spa := routes.NewSpaHandler("/ui", "index.html")
+		spa := routes.NewSpaHandler(utils.UIPath(), "index.html")
 		rootRouter.PathPrefix("/").Handler(spa)
 	}
 

api/utils/environment_variables.go

@@ -9,6 +9,7 @@ type EnvironmentVariable string
 const (
 	EnvDevelopmentMode EnvironmentVariable = "PHOTOVIEW_DEVELOPMENT_MODE"
 	EnvServeUI         EnvironmentVariable = "PHOTOVIEW_SERVE_UI"
+	EnvUIPath          EnvironmentVariable = "PHOTOVIEW_UI_PATH"
 	EnvMediaCachePath  EnvironmentVariable = "PHOTOVIEW_MEDIA_CACHE"
 )
 
@@ -49,3 +50,12 @@ func ShouldServeUI() bool {
 func DevelopmentMode() bool {
 	return EnvDevelopmentMode.GetValue() == "1"
 }
+
+// UIPath returns the value from where the static UI files are located if SERVE_UI=1
+func UIPath() string {
+	if path := EnvUIPath.GetValue(); path != "" {
+		return path
+	}
+
+	return "./ui"
+}