Replaced Debian's PostgreSQL client with version 17 and added the PostgreSQL apt repository for more control over versions. Switched from `apt` to `apt-get` for consistency, and included necessary dependencies like `wget` and `gnupg` for repository setup.
The addition of `postgresql-client` ensures tools relying on PostgreSQL are available within the container. This change improves compatibility with PostgreSQL-based workflows and resolves potential missing dependencies.
