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

[Utkarsh Gupta]

Review: Needs Information

Also, calling calling create_manifest calls snap-seed-parse, which _conditionally_ might result in duplicate snap listing. Can you confirm that the manifests produces after running your tests do not have duplicate snap lists? 
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https://code.launchpad.net/~codyshepherd/livecd-rootfs/+git/livecd-rootfs/+merge/475962
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