This simplifies the way that ibcli determines if the manifest
needs a bootstrap stage or not. The logic is simple:
- when doing `image-builder manifest` we never include one
- when doing `image-builder build --arch` we add one if the
target arch and host arch differ
Instead of passing a callback this is now just a simple bool
option. Thanks to Achilleas for suggesting this.
Co-Authored-by: Achilleas Koutsou <achilleas@koutsou.net>
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