fix: 'ocis backup consistency' file regex

'ocis backup consistency' was stumbling over revision (and trash) nodes
whose timestamp lacked the nanosecond component (which happens if the nanoseconds
of the mtime are 0)

Fixes: #9498

changelog/unreleased/fix-backup-consistency-cmd.md

@@ -0,0 +1,8 @@
+Bugfix: 'ocis backup consistency' fixed for file revisions
+
+A bug was fixed that caused the 'ocis backup consistency' command to incorrectly report
+inconistencies when file revisions with a zero value for the nano-second part of the
+timestamp were present.
+
+https://github.com/owncloud/ocis/pull/10493
+https://github.com/owncloud/ocis/issues/9498

ocis/pkg/backup/backup.go

@@ -28,9 +28,9 @@ var (
 
 	// regex to determine if a node is trashed or versioned.
 	// 9113a718-8285-4b32-9042-f930f1a58ac2.REV.2024-05-22T07:32:53.89969726Z
-	_versionRegex = regexp.MustCompile(`\.REV\.[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]+Z$`)
+	_versionRegex = regexp.MustCompile(`\.REV\.[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]+)?Z$`)
 	//   9113a718-8285-4b32-9042-f930f1a58ac2.T.2024-05-23T08:25:20.006571811Z <- this HAS a symlink
-	_trashRegex = regexp.MustCompile(`\.T\.[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}\.[0-9]+Z$`)
+	_trashRegex = regexp.MustCompile(`\.T\.[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]+)?Z$`)
 )
 
 // Consistency holds the node and blob data of a storage provider