Snap build failure caused by missed swagger ui css file. ``` :: [plugin vite:css] /build/gitea/parts/gitea/build/web_src/css/swagger-standalone.css:undefined:NaN :: Error: [postcss] ENOENT: no such file or directory, open '../../node_modules/swagger-ui-dist/swagger-ui.css' ``` Co-authored-by: silverwind <me@silverwind.io>