overlay/15fcos: strip extraneous version field from aleph file

This causes bootupctl to fails while parsing the file.
The extra field was introduced in coreos/coreos-assembler@c2d37f4
then quickly reverted in coreos/coreos-assembler#3686

Still, a couple of builds (39.20231204.1.0 and 39.20231204.2.1) went out with the change.
Fixing this will allow bootupctl to function properly on nodes deployed with this version.
This jq filter is idempotent so it's safe to run on all nodes.

This should be removed after the next barrier release.

Fixes coreos/fedora-coreos-tracker#1724

overlay.d/15fcos/usr/lib/systemd/system/coreos-fix-aleph-file.service

@@ -0,0 +1,13 @@
+# Remove after the next barrier release
+# https://github.com/coreos/fedora-coreos-tracker/issues/1724
+
+[Unit]
+Description=Remove extra attribute from aleph file
+
+[Service]
+Type=oneshot
+ExecStart=cat <<< $(jq 'del(.version)' /sysroot/.coreos-aleph-version.json) > /sysroot/.coreos-aleph-version.json
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target