feat: browser cache directives

http/static.go

@@ -2,6 +2,7 @@ package http
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/fs"
 	"log"
 	"net/http"
@@ -109,6 +110,9 @@ func getStaticHandlers(store *storage.Storage, server *settings.Server, assetsFs
 			return http.StatusNotFound, nil
 		}
 
+		const maxAge = 86400 // 1 day
+		w.Header().Set("Cache-Control", fmt.Sprintf("public, max-age=%v", maxAge))
+
 		if d.settings.Branding.Files != "" {
 			if strings.HasPrefix(r.URL.Path, "img/") {
 				fPath := filepath.Join(d.settings.Branding.Files, r.URL.Path)