feat: support static uri's with paths (#2399)

src/core/build/createWebpackConfig.ts

@@ -499,6 +499,11 @@ export default function createWebpackConfig(
               exclude: [/\.(js|ts|tsx)$/, /\.html$/, /\.json$/],
               loader: require.resolve("file-loader"),
               options: {
+                // Because the resources loaded via CSS can sometimes be loaded
+                // directly from a CSS file, this will ensure that they are
+                // relative to those referencing files.
+                publicPath: (loaderPublicPath: string) =>
+                  "../../" + loaderPublicPath,
                 name: isProduction
                   ? "assets/media/[name].[hash:8].[ext]"
                   : "assets/media/[name].[ext]",