This converts all fedora links in our samples to `mirrors.kernel.org`.
This mirror works best from around the world, so lets avoid the wild
mix of local mirrors and instead use kernel.org.
This mirror is also well-managed and properly funded, so we should not
run into too many problems with it.
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>
Instead of directly encoding the repo configuration make use of the
new sources api. The corresponding entry in samples/sources.json
which is referenced here ("sha256:450d4c0…") was added with the
previous commit ("92cfc57d720…").
"it's the future! 🛸" - Lars Karlitski
Bare bones example for image creation on s390x with MBR partition
layout and zipl bootloader. The kernel command line is configured
via the new org.osbuild.kernel-cmdline stage which needs to be run
before the dnf stage.
