journald: Do not trash the disk

...yup, sure, this is a hack. When we move to some other partition
layout, this will need changes; until then, let's do it this way because
of deadlines and stuff.

Change-Id: I6f353aa6479d66685691048757b83e2924ac2e65
diff --git a/board/czechlight/common/overlay/etc/systemd/journald.conf b/board/czechlight/common/overlay/etc/systemd/journald.conf
new file mode 100644
index 0000000..6f6f5aa
--- /dev/null
+++ b/board/czechlight/common/overlay/etc/systemd/journald.conf
@@ -0,0 +1,41 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+# Entries in this file show the compile time defaults.
+# You can change settings by editing this file.
+# Defaults can be restored by simply deleting this file.
+#
+# See journald.conf(5) for details.
+
+[Journal]
+Storage=volatile
+#Compress=yes
+#Seal=yes
+#SplitMode=uid
+#SyncIntervalSec=5m
+#RateLimitIntervalSec=30s
+#RateLimitBurst=1000
+#SystemMaxUse=
+#SystemKeepFree=
+#SystemMaxFileSize=
+#SystemMaxFiles=100
+#RuntimeMaxUse=
+#RuntimeKeepFree=
+#RuntimeMaxFileSize=
+#RuntimeMaxFiles=100
+#MaxRetentionSec=
+#MaxFileSec=1month
+#ForwardToSyslog=no
+#ForwardToKMsg=no
+#ForwardToConsole=no
+#ForwardToWall=yes
+#TTYPath=/dev/console
+#MaxLevelStore=debug
+#MaxLevelSyslog=debug
+#MaxLevelKMsg=notice
+#MaxLevelConsole=info
+#MaxLevelWall=emerg