osinfo-detect output incomplete information for generated Anaconda ISO

[chunfuwen]

After https://github.com/autotest/tp-libvirt/pull/5903/files was merged, it sound like :   osinfo-detect /var/lib/libvirt/images/output/bootiso/install.iso should output below information:"Media is bootable.\nMedia is an installer for OS '{osinfo}'\n".

But actually output below information:
(92lts-p3-ve) [root@xx tp-libvirt]# osinfo-detect /var/lib/libvirt/images/output/bootiso/install.iso 
Media is bootable.


Also check the pipeline output, finding that architectures information may be wrong("X64")

...
[stdout]   "isolabel": "Container-Installer-x86_64",
[stdout]   "architectures": [
[stdout]     "X64"
[stdout]   ],
[stdout]   "vendor": "centos"
[stdout] }
[stdout] kernel dir at /images/pxeboot
...