Convert all remaining json manifests to yaml

This conversion can be validated using this script:

 #!/bin/bash

mkdir -p repo && cd repo && ostree init --repo . --mode=archive && cd ..
variants=('silverblue' 'kinoite' 'xfce' 'lxqt')

for v in ${variants[@]}; do
    sudo rpm-ostree compose tree --repo=repo --print-only fedora-$v.yaml > $v.yaml.out
done

git checkout --quiet HEAD~
for v in ${variants[@]}; do
    sudo rpm-ostree compose tree --repo=repo --print-only fedora-$v.yaml > $v.json.out
done

for v in ${variants[@]}; do
    if [[ ! -z $(diff $v.json.out $v.yaml.out) ]]; then
        echo ""
        echo "$v: JSON != YAML"
        diff $v.json.out $v.yaml.out
        echo ""
        has_diff="true"
    fi
done

git checkout --quiet master
rm -rf ./repo
for v in ${variants[@]}; do
    rm ./$v.json.out ./$v.yaml.out
done

if [[ $has_diff == "true" ]]; then
    echo "Found some diff!"
else
    echo "OK!"
fi

fedora-common-ostree.yaml

@@ -0,0 +1,58 @@
+ref: fedora/rawhide/${basearch}/ostree-base
+
+automatic_version_prefix: "31"
+mutate-os-release: "31"
+
+include: fedora-common-ostree-pkgs.yaml
+
+packages:
+  - buildah
+  - flatpak
+  - flatpak-builder
+  - git-core
+  - lvm2
+  - podman
+  - rpm-ostree
+  - skopeo
+  - toolbox
+  - xdg-desktop-portal
+
+selinux: true
+documentation: true
+boot_location: new
+etc-group-members:
+  - wheel
+tmp-is-dir: true
+
+postprocess-script: post.sh
+
+ignore-removed-users:
+  - root
+ignore-removed-groups:
+  - root
+check-passwd: { type: file, filename: passwd }
+check-groups: { type: file, filename: group }
+
+default_target: graphical.target
+
+# Keep this in sync with fedora-atomic-host.json from fedora-atomic
+packages-aarch64:
+  - grub2-efi
+  - ostree-grub2
+  - efibootmgr
+  - shim
+packages-armhfp:
+  - extlinux-bootloader
+packages-ppc64:
+  - grub2
+  - ostree-grub2
+packages-ppc64le:
+  - grub2
+  - ostree-grub2
+packages-x86_64:
+  - grub2
+  - grub2-efi-x64
+  - ostree-grub2
+  - efibootmgr
+  - shim
+  - microcode_ctl