fix: Add postgres envvar to dev.env

[Vincent-lau]

The postgres envvar is missing in the dev.env, and this results in postgres' health check failing as it uses these envvars. this makes the health check default envvar like POSTGRES_USER to blank string. For some reason it is not enough just to specify them in the environment section of the docker compose file so add these to dev.env just like deploy.env

Summary by Sourcery

Bug Fixes:

• Include Postgres env vars (e.g., POSTGRES_USER) in dev.env to prevent blank defaults and health check failures

[sourcery-ai]

Reviewer's Guide

This PR ensures the PostgreSQL health check has the required credentials by copying the missing environment variables from deploy.env into dev.env.

File-Level Changes

Change	Details	Files
Add missing Postgres environment variables to dev.env	Added POSTGRES_USER Added POSTGRES_PASSWORD Added POSTGRES_DB	dev.env

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[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Hey @Vincent-lau - I've reviewed your changes and they look great!

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