feat(docker): make the core NATS bind host configurable

[FelixTJDietrich]

Motivation

core-nats-server was published only on 127.0.0.1:4222, so nothing off-box could reach the bus. But the integration/sync consumers in other environments are meant to consume events from an upstream environment's JetStream (see docker/preview/compose.app.yaml — HEPHAESTUS_SYNC_NATS_SERVER may point at an upstream NATS). With a hardcoded loopback bind that's impossible, and those consumers fail to start.

Change

Bind the port via ${NATS_BIND_HOST:-127.0.0.1}:

• Default unchanged — loopback-only, so existing single-host deployments keep the safe posture.
• Operators can set NATS_BIND_HOST=0.0.0.0 (or a specific interface address) to expose the bus to other hosts.

The bus is unauthenticated, so the changeset and the inline comment both spell out that exposure belongs only on a trusted or firewalled network.

Testing

• docker compose config validates.
• No application code changed; Java/TS gates N/A (docker/ + changeset only).

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📥 Commits

Reviewing files that changed from the base of the PR and between 6faed3b and 3f19275.

📒 Files selected for processing (2)

• .changeset/configurable-nats-bind.md
• docker/compose.core.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/configurable-nats-bind

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