Pin Postgres Docker image to v17 to avoid breaking changes

[mdkaifansari04]

Description:
Since the default Docker image now pulls Postgres 18, our DB container fails to start because the volume uses the old data directory format (/var/lib/postgresql/data). Postgres 18 expects a new structure and rejects the mount, breaking local dev.

Resolution:
Update docker-compose.yml to use postgres:17 for the DB image. This pins the Postgres version and avoids the incompatible data directory error until we have time to plan a migration to 18.

References:

• Postgres 18 Docker breaking change
• Full migration discussion

Error while spinning up the container for BLT

[Ashuthosh0]

@mdkaifansari04 hey checkout #4717, an open issue already exists on this.

[mdkaifansari04]

Yeah haven't seen that's open, but eventually I am working on the fix. I'll link both in the pr.

Thanks

[mdkaifansari04]

/assign

[github-actions]

Hello @mdkaifansari04! You've been assigned to OWASP-BLT/BLT issue #4765. You have 24 hours to complete a pull request.