Allow cross-arch building for iso's

[cdrage]

See issue: https://github.com/containers/podman-desktop-extension-bootc/issues/149

as well as the code below:

https://github.com/osbuild/bootc-image-builder/blob/acb5af53c36b2613665e19617ca2f713ef625d34/bib/cmd/bootc-image-builder/main.go#L251

I did not see an open issue yet for being able to select different arches for building iso.

At the moment, in order to build .iso, you will have to make sure to not pass in target-arch even if it matches the current architecture.

I didn't see an issue opened up for this issue.

[deboer-tim]

Even if cross-arch compiling wasn't supported it would be great if the error was omitted when the passed --target-arch matches the current arch (i.e. the same as passing no target).

[ondrejbudai]

Cross-compiling an ISO is currently out of scope due to technical complexity. However, relaxing the check for the cases when target-arch == current-arch() indeed makes sense. @mvo5 May I ask you to take a look?

[mvo5]

Cross-compiling an ISO is currently out of scope due to technical complexity. However, relaxing the check for the cases when target-arch == current-arch() indeed makes sense. @mvo5 May I ask you to take a look?

Sorry, I missed this and only saw it now. I opened https://github.com/osbuild/bootc-image-builder/pull/364 that should address this.

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[cdrage]

Still relevant