buildah: ubuntu 18.04 can't add ppa:projectatomic/ppa repository

When I created buildah in Ubuntu 18.04, I found that I could not add the ppa:projectatomic/ppa repository. The details are as follows:

➜  ~ sudo -E apt-add-repository -y ppa:projectatomic/ppa
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://dl.google.com/linux/chrome/deb stable Release [1,189 B]           
Hit:4 http://ppa.launchpad.net/git-core/ppa/ubuntu bionic InRelease                                       
Hit:5 https://mirrors.ustc.edu.cn/ubuntu bionic InRelease                                                 
Hit:6 https://mirrors.ustc.edu.cn/ubuntu bionic-updates InRelease              
Hit:7 http://ppa.launchpad.net/noobslab/icons/ubuntu bionic InRelease    
Hit:8 https://mirrors.ustc.edu.cn/ubuntu bionic-backports InRelease      
Hit:9 https://mirrors.ustc.edu.cn/ubuntu bionic-security InRelease       
Hit:10 https://mirrors.ustc.edu.cn/ubuntu bionic-proposed InRelease      
Ign:11 http://ppa.launchpad.net/projectatomic/ppa/ubuntu bionic InRelease
Err:12 http://ppa.launchpad.net/projectatomic/ppa/ubuntu bionic Release
  404  Not Found [IP: *********]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/projectatomic/ppa/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Is this repository not yet providing support for 18.04? Is there any good solution?

（I don’t know which side to report on this issue. I didn’t find any better place, so I can only ask this question in this community. Hope you don’t mind.）