zuul ci mock build fails without any meaningful error, just "POST_FAILURE"

while having opened console during recheck, I can see that mock build actually succeeded and it complains about host verification failuer

2024-06-18 17:57:37.237499 | centos.softwarefactory-project.io |   "msg": "Data could not be sent to remote host \"centos.softwarefactory-project.io\". Make sure this host can be reached over ssh: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n@       WARNING: POSSIBLE DNS SPOOFING DETECTED!          @\r\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\nThe RSA host key for centos.softwarefactory-project.io has changed,\r\nand the key for the corresponding IP address 192.168.242.109\r\nis unknown. This could either mean that\r\nDNS SPOOFING is happening or the IP address for the host\r\nand its host key have changed at the same time.\r\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @\r\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\nIT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!\r\nSomeone could be eavesdropping on you right now (man-in-the-middle attack)!\r\nIt is also possible that a host key has just been changed.\r\nThe fingerprint for the RSA key sent by the remote host is\nSHA256:AqlNIgvoUJP37YoXTjgZ/zbRobLKvyRPEP1if2zU5lQ.\r\nPlease contact your system administrator.\r\nAdd correct host key in /var/lib/zuul/builds/e337da19b6564a6ca7d0dcd819bcc580/work/.ssh/known_hosts to get rid of this message.\r\nOffending RSA key in /var/lib/zuul/builds/e337da19b6564a6ca7d0dcd819bcc580/work/.ssh/known_hosts:5\r\nRSA host key for centos.softwarefactory-project.io has changed and you have requested strict checking.\r\nHost key verification failed.\r\n",

Checking https://centos.softwarefactory-project.io/zuul/t/centos/builds seems all build since this afternoon are failing.