Added configurable postgres tag and dst mount path to the docker compose

[alessandromarchetti]

Your checklist for this pull request

• I've read the contributing guideline.
• I've tested my changes by building and running mquery, and testing changed functionality (if applicable)
• I've added automated tests for my change (if applicable, optional)
• I've updated documentation to reflect my change (if applicable)

What is the current behaviour?
Currently, the docker-compose.yml file doesn't specify a PostgreSQL version, defaulting to 'latest'. With PostgreSQL 18's recent release, this causes container startup failures due to a changed data directory path from /var/lib/postgresql/data to /var/lib/postgresql.

What is the new behaviour?

• Added explicit version control for PostgreSQL in docker-compose.yml
• Set PostgreSQL 17 as the default version to maintain stability
• Added environment variables to control PostgreSQL version and data path
• This prevents the startup failure by ensuring compatibility with the mounted volumes

Closing issues
fixes #456