sys-kernel/bootengine: Ensure /run/ignition.env exists on every boot

This pulls in flatcar/bootengine#86 to fix the
previous rework that only created /run/ignition.env on the first boot
while we rely on it to run cloud-init on every boot when no Ignition
config was provided.

sdk_container/src/third_party/coreos-overlay/sys-kernel/bootengine/bootengine-9999.ebuild

@@ -10,7 +10,7 @@ CROS_WORKON_REPO="https://github.com"
 if [[ "${PV}" == 9999 ]]; then
 	KEYWORDS="~amd64 ~arm ~arm64 ~x86"
 else
-	CROS_WORKON_COMMIT="10341079dde4bf7f8fbdb8a01a73b94da355c1ba" # flatcar-master
+	CROS_WORKON_COMMIT="d30cbf22a7f8ffc462932ae0a5d4c6de249c2b11" # TODO: flatcar-master
 	KEYWORDS="amd64 arm arm64 x86"
 fi