repart: Copy fs-verity status for CopyFiles=

When populating a filesytem with CopyFiles=, we first copy the files to
a temporary directory.  Make sure we use the (new) COPY_FS_VERITY flag
when doing that copy so that the `mkfs` that we invoke can see the files
with fs-verity enabled.

Closes systemd#35352

Signed-off-by: Allison Karlitskaya <allison.karlitskaya@redhat.com>

Author: allisonkarlitskaya

src/repart/repart.c

@@ -5642,14 +5642,14 @@ static int do_copy_files(Context *context, Partition *p, const char *root) {
                                                 sfd, ".",
                                                 pfd, fn,
                                                 UID_INVALID, GID_INVALID,
-                                                COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN|COPY_TRUNCATE|COPY_RESTORE_DIRECTORY_TIMESTAMPS,
+                                                COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN|COPY_TRUNCATE|COPY_RESTORE_DIRECTORY_TIMESTAMPS|COPY_FS_VERITY,
                                                 denylist, subvolumes_by_source_inode);
                         } else
                                 r = copy_tree_at(
                                                 sfd, ".",
                                                 tfd, ".",
                                                 UID_INVALID, GID_INVALID,
-                                                COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN|COPY_TRUNCATE|COPY_RESTORE_DIRECTORY_TIMESTAMPS,
+                                                COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN|COPY_TRUNCATE|COPY_RESTORE_DIRECTORY_TIMESTAMPS|COPY_FS_VERITY,
                                                 denylist, subvolumes_by_source_inode);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to copy '%s%s' to '%s%s': %m",