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doc: CI - Describe qemu-user-static usage

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Should help in cases such as: https://github.com/bitcoin/bitcoin/pull/31144#issuecomment-2450578651
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Hodlinator
2025-11-17 15:06:56 +01:00
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ci/README.md
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@@ -28,6 +28,15 @@ the CI locally you may need to reduce that entropy by running:
sudo sysctl -w vm.mmap_rnd_bits=28
```
To run a test that requires emulating a CPU architecture different from the
host, we may rely on the container environment recognizing foreign executables
and automatically running them using `qemu`. The following sets us up to do so
(also works for `podman`):
```
docker run --rm --privileged docker.io/multiarch/qemu-user-static --reset -p yes
```
It is recommended to run the CI system in a clean environment. The `env -i`
command below ensures that *only* specified environment variables are propagated
into the local CI.