[Libguestfs] [PATCH] templates: Add CentOS Stream 8

This adds CentOS Stream 8 to the set of images that the builder can use. CentOS Stream 8 is a continuously delivered upstream of the next RHEL 8.x release. It doesn't have a minor version number. It appears that my index-fragment has a hash in it, and thus this commit may need to be amended by the maintainer before merging into the main repo. This has been tested by creating a local centosstream-8.xz image then consuming that image via a local repos.d file and using virt-builder to build a bootable CentOS Stream 8 image: $ cat ~/.config/virt-builder/repos.d/local.conf [local] uri=file:///data/src/guestfs-tools/builder/templates/index $ virt-builder --list | grep stream centosstream-8 x86_64 CentOS Stream 8 $ virt-builder centosstream-8 [ 1.0] Downloading: file:///data/src/guestfs-tools/build... [ 1.7] Planning how to build this image [ 1.7] Uncompressing [ 7.8] Opening the new disk [ 12.6] Setting a random seed [ 12.6] Setting passwords virt-builder: Setting random password of root to qmjtBFyLX... [ 13.5] Finishing off Output file: centosstream-8.img Output size: 6.0G Output format: raw Total usable space: 5.4G Free space: 3.8G (71%) -- Stef Walter (he / his) Linux Engineering Red Hat