Make backup command independent of the Docker project name

[bschmalhofer]

In https://doc.otobo.org/manual/installation/11.0/en/content/backup-restore-docker.html there is the command

docker_admin>docker run -it --rm --volume otobo_opt_otobo:/opt/otobo --volume otobo_backup:/otobo_backup --network otobo_default rotheross/otobo:latest-11_0 scripts/backup.pl --extra-dump-options="--single-transaction" -d /otobo_backup

This command assumes that the Docker project name is otobo and used that name for the options --volume and --network. This works fine in most installations, but causes confusing errors when a different name is declared in ,env.

TODO:

• document that the backup script must be called in the docker-compose directory on the Docker host
• extract the project name from .env
• use the correct name in the backup command
• as a bonus: use the declared IMAGE in the command or use docker compose exec.