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Markus Hilger
7633bac055
Allow building EL and Ubuntu diskless images for a foreign architecture (e.g. aarch64 on an x86_64 host) by leveraging qemu-user-static. The target architecture is detected automatically from a -s source tree (for EL), or may be requested explicitly with the new --arch option. When the target differs from the host, dnf/debootstrap is invoked with --forcearch/--arch and the presence of an enabled binfmt_misc handler with the F (fix-binary) flag is verified up front, so emulation keeps working inside the installroot chroot and a missing setup yields an actionable error instead of a confusing exec failure mid-build. The image architecture is recorded in confluentimg.buildinfo so that pack selects the initramfs addons for the image architecture rather than the build host, and exec of a foreign-arch root performs the same binfmt check.