A simple Textpattern set-up.

Create a new file with Textpattern config from initial docker-compose up...

docker cp config.php txp-web:/var/www/html/textpattern/

Set correct timezone for PHP:

docker cp php.ini txp-web:/usr/local/etc/php/php.ini

docker exec txp-web rm -rd /var/www/html/textpattern/setup

docker exec -i txp-db mysql -u root -ptxproot txp < BACKUP/filtxp.sql

For example, from backup:

docker cp BACKUP/files txp-web:/var/www/html/
docker cp BACKUP/images txp-web:/var/www/html/