Trim filesystems after TemplateVM update

After most update processes are finished, templates can benefit from performing
an fstrim operation due to the large amounts of writes performed during the
update process.

Signed-off-by: Atrate <Atrate@protonmail.com>

Author: Atrate

qubes-rpc/post-install.d/95-fstrim.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/sh
+
+# perform fstrim on all partitions after finishing update-related I/O
+
+# only run if storage is persistent
+if [ -f /run/qubes/persistent-full ]
+then
+    fstrim -av
+fi