configure kiwi 10's mapper to kpartx

Kiwi 10 switched to use partx, which requires udev to operate. As we don't have
udev in the container, we create a custom config file that forces the usage of
kpartx

src/bci_build/package/kiwi.py

@@ -4,13 +4,25 @@
 from bci_build.os_version import ALL_NONBASE_OS_VERSIONS
 from bci_build.os_version import CAN_BE_LATEST_OS_VERSION
 from bci_build.os_version import OsVersion
+from bci_build.package import DOCKERFILE_RUN
 from bci_build.package import DevelopmentContainer
 from bci_build.package import ParseVersion
 from bci_build.package import generate_disk_size_constraints
 from bci_build.package.helpers import generate_package_version_check
 from bci_build.package.versions import format_version
 from bci_build.package.versions import get_pkg_version
 
+
+def generate_kiwi_10_config():
+    """force part_mapper to be kpartx rather than the default udev, which we don't run in the image."""
+    return f"""
+{DOCKERFILE_RUN} cat - > /etc/kiwi.yml <<EOF
+mapper:
+  - part_mapper: kpartx
+EOF
+"""
+
+
 KIWI_CONTAINERS = [
     DevelopmentContainer(
         name="kiwi",
@@ -54,7 +66,10 @@
             *os_version.release_package_names,
         ]
         + os_version.common_devel_packages,
-        custom_end=f"{generate_package_version_check('python3-kiwi', kiwi_minor, ParseVersion.MINOR)}",
+        custom_end=(
+            f"{generate_package_version_check('python3-kiwi', kiwi_minor, ParseVersion.MINOR)}"
+        )
+        + (generate_kiwi_10_config() if float(kiwi_minor) >= 10 else ""),
         build_recipe_type=BuildType.DOCKER,
         _min_release_counter=(15 if os_version.is_sle15 else None),
         extra_labels={