Improve guide on how to do CI/CD
We are adding docs now to help users create their our CI/CD jobs to test and deploy their dbt projects.
It would be nice to have more in-depth guides on how they can create them. These guides should be adapted to ClickHouse's best practices.
Context: https://github.com/ClickHouse/clickhouse-docs/pull/4562#discussion_r2425675580 CC @morsapaes @laeg
About recommending using backups to create testing envs: https://github.com/ClickHouse/clickhouse-docs/pull/4562#discussion_r2425776707
There's one talk in Coalesce 2025 about this. I'll try to see it and bring here some conclusions https://coalesce.getdbt.com/hub/events/21662b38-2c17-4c10-9dd7-964fd652ab44/sessions/2dfb855c-5233-41f0-bed9-1089d0b7ece7