README: document that cross building works
Document how cross building works.
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README.md
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README.md
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@ -121,6 +121,20 @@ $ sudo image-builder build qcow2 --blueprint ./config.toml --distro centos-9
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...
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```
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### Cross architecture building
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When `qemu-user-static` is installed images can be build for foreign
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architectures. To do this, pass `--arch`, e.g.:
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```console
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$ sudo image-builder build --arch=riscv64 minimal-raw --distro fedora-41
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```
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building is about 8x-10x slower than native building but still fast
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enough to be usable.
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Note that this feature is considered experimental currently.
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### SBOMs
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It is possible to generate spdx based SBOM (software bill of materials)
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