https://dev.mysql.com/doc/relnotes/workbench/en/wb-news-8-0-12.html
Changes in MySQL Workbench 8.0.12 (2018-07-27, General Availability) ... Functionality Added or Changed ... libgnome-keyring was depreciated and replaced with libsecret in this release on Linux platforms. Some users with existing stored passwords will be prompted to enter a password after upgrading. (Bug #27635281, Bug #89898, Bug #20291538, Bug #75345)