overlay.d: fips: s390x: fix zipl parmfile

Zipl expects only kernel command line options in the parmfile.
If a whole bls file is provided as a parmfile, the system will
not be able to boot and switch to rescue mode after reboot.

overlay.d/05rhcos/usr/lib/dracut/modules.d/40rhcos-fips/rhcos-fips.sh

@@ -70,18 +70,22 @@ firstboot() {
       # We need to call zipl with the kernel image and ramdisk as running it without these options would require a zipl.conf and chroot
       # into rootfs
       tmpfile=$(mktemp)
+      optfile=$(mktemp)
       for f in "${tmpsysroot}"/boot/loader/entries/*.conf; do
           for line in title version linux initrd options; do
               echo $(grep $line $f) >> $tmpfile
           done
       done
+
       echo "Appending 'ignition.firstboot' to ${tmpfile}"
       sed -e "/^options / s/$/ ignition.firstboot/" -i "$tmpfile"
+      grep options $tmpfile | cut -c 9- > $optfile
+
       zipl --verbose \
            --target "${tmpsysroot}/boot" \
            --image $tmpsysroot/boot/"$(grep linux $tmpfile | cut -d' ' -f2)" \
            --ramdisk $tmpsysroot/boot/"$(grep initrd $tmpfile | cut -d' ' -f2)" \
-           --parmfile $tmpfile
+           --parmfile $optfile
     fi
 
     echo "Rebooting"