Fix brittle test

server/server_test.go

@@ -870,7 +870,7 @@ func TestServer_PublishAttachment(t *testing.T) {
 	require.Equal(t, "attachment.txt", msg.Attachment.Name)
 	require.Equal(t, "text/plain; charset=utf-8", msg.Attachment.Type)
 	require.Equal(t, int64(5000), msg.Attachment.Size)
-	require.GreaterOrEqual(t, msg.Attachment.Expires, time.Now().Add(3*time.Hour).Unix())
+	require.GreaterOrEqual(t, msg.Attachment.Expires, time.Now().Add(179*time.Minute).Unix()) // Almost 3 hours
 	require.Contains(t, msg.Attachment.URL, "http://127.0.0.1:12345/file/")
 	require.Equal(t, "", msg.Attachment.Owner) // Should never be returned
 	require.FileExists(t, filepath.Join(s.config.AttachmentCacheDir, msg.ID))