Here is what I posted to github issues:
https://github.com/wallabag/docker/issues/153
In the hopes of saving someone else time, the Ansible script that runs is located here: entrypoint.yml
for some reason when Ansible tries to connect to the db host, mariadb closes the connetion: [Warning] Aborted connection 8 to db: 'unconnected' user: 'unauthenticated' host: '192.168.0.4' (This connection closed normally without authentication)
even though when you connect to the container: docker exec -it dcebf5dcbda1 sh
you can connect to the database just fine: mysql -h $SYMFONY__ENV__DATABASE_HOST -u root -p$MYSQL_ROOT_PASSWORD
But if I manually run the playbook: ansible-playbook -i /etc/ansible/hosts /etc/ansible/entrypoint.yml -c local "$@"
I get the warning: [WARNING]: Found both group and host with same name: localhost
But the playbook successfully completes.
If it doesn't (or if you have defined the mariadb user and database name in your compose file) you can try the POPULATE_DATABASE=false and then run php bin/console wallabag:install --env=prod -n from the /var/www/wallabag directory.
I think (untested) if you ran ansible-playbook -i ${HOSTNAME}, /etc/ansible/entrypoint.yml -c local "$@" instead of using an inventory and there was a check for if {{ database_name }} exists - name: add mariadb db in the playbook, it might work a little better. But I'm not sure how to stop mariadb from closing the connection.
hope this helps.