Add 24 hour caching of public images (#1777)

Author: mkst

frontend/next.config.js

@@ -64,6 +64,16 @@ let app = removeImports({
                     },
                 ],
             },
+            {
+                // cache images for 24 hours
+                source: "/:all*(png|jpg|jpeg|gif|svg|ico|webp)",
+                headers: [
+                    {
+                        key: "Cache-Control",
+                        value: "public, max-age=86400, stale-while-revalidate=86400",
+                    },
+                ],
+            },
         ];
     },
     webpack(config) {