KanBoard

Lost Amdin-Password
#Login to Shell
$ docker exec -it ee29a28a0478 /bin/sh

$ php -a

Interactive shell
php > echo password_hash('admin', PASSWORD_DEFAULT);
$2y$10$i1VwOewr1H8NGHisJutM/eFkudRoFjWE2PaTIbEUsphDcbZXgsyG6

UPDATE users SET password='replace_me' WHERE username='admin';

You can dump the database to a text file of sql commands like this: 
sqlite3 db.sqlite .dump > kanboard.dump.sql

Another option is to create a backup in sqlite format: 
sqlite3 db.sqlite ".backup kanboard.backup.sqlite"