Commits on Feb 7, 2024

1. bib: add cross arch building …

   This commit adds experimental cross arch building.
   
   I.e. you `bootc-image-builder` on a mac and target an `amd64` machine.
   
   The usage would be:
   ```
   sudo podman run ... \
     --type qcow2 \
     --target-arch amd64 \
        quay.io/centos-bootc/fedora-bootc:eln
   ```
   and this is predicated on the idea that the target container is
   available for both host and target architecture. When that is the case
   the container for the host architecture is used as a buildroot, the
   container for the target architecture is the target tree. Note that some
   stages chroot into the target tree so `qemu-user` is essential for this
   to work so that target achitecture code can be run transparently (because
   only very small amounts of code need to run emulated this is pretty fast
   still).
   
   It will need qemu-user{,-static} installed on the host. Sadly we
   cannot just install qemu-user into the container because the binfmt_misc
   system is global and not namespaced. So while adding the binfmt_misc
   handler from inside the container would work with enough privs it
   would alter the global machine state and we should not do it.

   

   mvo5 committed Feb 7, 2024
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