Add R! to systemd-tmpfiles script for all /tmp dirs

We already used `x` in tmpfiles, to ensure systemd did not remove
our directories or clean their contents (we really need them to
be left unmodified). However, systemd-tmpfiles lets us use more
than one directive per line, which means we can safely add an R!
(recursive remove on reboot) to these lines to ensure that, if
/tmp is not a tmpfs, systemd-tmpfiles will still remove our
temporary files, ensuring reboots are still accurately detected.

Signed-off-by: Matt Heon <[email protected]>

Author: mheon

contrib/tmpfile/podman.conf

@@ -1,9 +1,16 @@
 # /tmp/podman-run-* directory can contain content for Podman containers that have run
-# for many days. This following line prevents systemd from removing this content.
+# for many days. The following lines prevents systemd from removing this content.
+# At the same time, these directories must also be cleaned on reboot.
+# Thus, each path has two lines: x to not periodically clean, R! to recursively
+# remove on reboot.
 x /tmp/podman-run-*
+R! /tmp/podman-run-*
 x /tmp/storage-run-*
+R! /tmp/storage-run-*
 x /tmp/containers-user-*
+R! /tmp/containers-user-*
 x /tmp/run-*/libpod
+R! /tmp/run-*/libpod
 D! /var/lib/containers/storage/tmp 0700 root root
 D! /run/podman 0700 root root
 D! /var/lib/cni/networks