added use of errgroup's ctx to handle feiled http server startup grac…#1

dmitrymomot merged 2 commits intodmitrymomot:maindmitrymomot/httpserver:mainfrom

dmitrorezn:fix_gracefull_shutdown_on_failed_startdmitrorezn/httpserver:fix_gracefull_shutdown_on_failed_startCopy head branch name to clipboard