buer: file-systems: Add an @snapshot subvolume

operating-systems/buer/file-systems.scm

@@ -129,6 +129,18 @@
                                discard=async,~
                                ssd")))
 
+        #|snapshots|#
+        (file-system
+          (device partition:guix)
+          (type "btrfs")
+          (mount-point "/snapshots")
+          (check? #f)
+          (needed-for-boot? #t)
+          (flags '(no-atime))
+          (options (format #f "compress=zstd,~
+                               subvol=@snapshots,~
+                               ssd")))
+
         #|home|#
         (file-system
           (device partition:guix)