[Merge] ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:fix/riscv64-manifest-gen into livecd-rootfs:ubuntu/jammy

[Cody Shepherd]

Cody Shepherd has proposed merging ~codyshepherd/livecd-rootfs/+git/livecd-rootfs:fix/riscv64-manifest-gen into livecd-rootfs:ubuntu/jammy.

Commit message:
LP:#2086455 - generate manifests even if returning early under riscv64 subarch conditions.

Requested reviews:
  Canonical Cloudware (cloudware)
  Canonical Foundations Team (canonical-foundations)
Related bugs:
  Bug #2086455 in livecd-rootfs (Ubuntu): "manifest not generated for ubuntu-cpc uefi hook in riscv64 when no subarch present"
  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2086455

For more details, see:
https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/475962

Tested by reproducing the failure with a livefs build, then performing another livefs build using a personal ppa built from this branch. Build was successful.
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