Update README on cross-building images.

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Ting-Yu Wang 2020-07-17 17:43:32 -07:00 committed by gVisor bot
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@ -59,3 +59,12 @@ project.
The continuous integration system can either take fine-grained dependencies on
individual `push` targets, or ensure all images are up-to-date with a single
`push-all-images` invocation.
## Multi-Arch images
By default, the image is built for host architecture. Cross-building can be
achieved by specifying `ARCH` variable to make. For example:
```
$ make ARCH=aarch64 rebuild-default
```