As long as this matches the build environment, this does not make
a differenece, but let us not depend on this.
This will be useful when automatically transforming dnf to rpm
pipelines, as the platform_module_id is needed as input to
osbuild-composer's dnf-json tool.
Performed using this script:
```
cat $1 | jq '(.stages[]? | select(.name == "org.osbuild.dnf") | .options.module_platform_id) |= . + "platform:f30"' | sponge $1
cat $1 | jq '(.build.pipeline.stages[]? | select(.name == "org.osbuild.dnf") | .options.module_platform_id) |= . + "platform:f30"' | sponge $1
```
Signed-off-by: Tom Gundersen <teg@jklm.no>
Include a example of a ppc64le (open firmware) pipeline based on
f30-s390x. It includes changes to the grub2 stage (selecting the
platform), the partition table contains the PReP partition needed
to store the grub2 core image.
