fix(docker): bind postgres to localhost only

[nick-stebbings]

Summary

The default docker-compose.yml exposes postgres on all interfaces (0.0.0.0:5432), making it reachable from the local network in any docker compose deployment. This binds it to 127.0.0.1:5432:5432 so it's only accessible from the host machine.

Test plan

• docker compose up still works
• psql -h 127.0.0.1 -U ironclaw -d ironclaw connects
• Postgres is not reachable from other machines on the network

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the default security configuration of the Docker Compose setup by ensuring the PostgreSQL database is only accessible from the host machine. This change prevents unintended network exposure of the database to other machines on the local network, thereby improving the security posture of the development environment by default.

Highlights

• Postgres Binding: The PostgreSQL service in docker-compose.yml was updated to bind to 127.0.0.1 (localhost) instead of 0.0.0.0, restricting its network accessibility to the host machine only.

Changelog

• docker-compose.yml
  • Updated the PostgreSQL service port binding to localhost.

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[gemini-code-assist]

Code Review

This pull request correctly enhances security by binding the PostgreSQL service in the Docker Compose setup to localhost. This prevents unintended exposure on local networks. My review includes one suggestion to further improve the configuration's flexibility for developers by making the host port configurable, which can help avoid common port conflicts in local environments.

[gemini-code-assist]

To improve flexibility for local development, consider making the host port configurable using an environment variable. This will prevent potential port conflicts if a developer already has a service running on port 5432. Using a variable with a default value allows for easy overrides without breaking the default setup.

      - "127.0.0.1:${POSTGRES_PORT:-5432}:5432"