kiwi-build: Pass on arguments after "--" to kiwi

This simplifies supporting one-off custom actions without having to
define options in the helper script all the time.

kiwi-build

@@ -46,6 +46,9 @@ while true; do
 	esac
 done
 
+# Capture arguments after --
+kiwibuild_extra_args=("$@")
+
 if [ -z "$output_dir" ] || [ -z "$image_type" ] || [ -z "$image_profile" ] || [ -z "$kiwi_file" ]; then
 	echo "Options not set!"
 	usage
@@ -56,7 +59,8 @@ kiwi_bundle_format=$("${kiwibuild_scriptdir}/scripts/fedora-kiwi-bundle-format-g
 
 if [ "$image_type" = "iso" ]; then
 	# Add parameters for embedded ISO IDs
-	kiwibuild_extra_args=$("${kiwibuild_scriptdir}/scripts/fedora-live-iso-label-generator" "${kiwi_file}" "${image_profile}" --output-kiwi-args)
+	kiwibuild_iso_extra_args=$("${kiwibuild_scriptdir}/scripts/fedora-live-iso-label-generator" "${kiwi_file}" "${image_profile}" --output-kiwi-args)
+	kiwibuild_extra_args="${kiwibuild_extra_args:+${kiwibuild_extra_args}} ${kiwibuild_iso_extra_args}"
 fi
 
 if [ "$image_type" = "oci" ]; then