overlay.d/05core: disable bootloader-update.service on live ISO

When running from live-iso `bootupctl` fails with:

    error: Querying adoptable state: creation time is not available for the filesystem

That happens because ISO9660 doesn't support statx.stc_btime filed:

    $ stat /sysroot/.coreos-aleph-version.json
    Access: 2022-08-01 23:42:11.000000000 +0000
    Modify: 2022-08-01 23:42:11.000000000 +0000
    Change: 2022-08-01 23:42:11.000000000 +0000
     Birth: -

Author: nikita-dubrovskii

overlay.d/05core/usr/lib/systemd/system-generators/coreos-liveiso-disable-bootupd-generator

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -euo pipefail
+
+. /usr/lib/coreos/generator-lib.sh
+
+if ! have_karg coreos.liveiso; then
+    exit 0
+fi
+
+# In Fedora 43 and CentOS Stream 9+, bootupd is enabled by default.
+# On the live ISO, it fails because ISO9660 doesn't support
+# statx.stx_btime. Disable the service there.
+# https://github.com/coreos/fedora-coreos-tracker/issues/2136
+mkdir -p "${UNIT_DIR}/bootloader-update.service.d"
+cat >"${UNIT_DIR}/bootloader-update.service.d/10-liveiso-disable.conf" <<EOF
+[Unit]
+ConditionKernelCommandLine=!coreos.liveiso
+EOF