Regarding hetzner_rhel9.md, it looks like x86_64 is no longer a valid tag. installimage fails as it can no longer detect image's architecture from that filename.
I'm not sure when this has changed as it definitely worked before, but renaming CentOS-91-el-x86_64-minimal.tar.xz to something like CentOS-91-el-amd64-minimal.tar.xz worked.
Regarding hetzner_rhel9.md, it looks like
x86_64
is no longer a valid tag. installimage fails as it can no longer detect image's architecture from that filename.I'm not sure when this has changed as it definitely worked before, but renaming
CentOS-91-el-x86_64-minimal.tar.xz
to something likeCentOS-91-el-amd64-minimal.tar.xz
worked.