Containerize the relay runtime

[ariobarin]

Summary

• add a multi-stage Node 24 relay image that runs as the non-root node user
• extend Compose to run the relay with Postgres on loopback-only host ports
• smoke-test the built container in Linux CI and document the Docker self-hosting path

Production Heroku remains on its supported Node buildpack deployment in this PR. This adds and validates the container artifact without coupling it to a production stack migration.

Validation

• npm run check
• docker build --progress=plain -t glossa-relay-pr1 .
• docker compose -p glossa-pr1 up -d --build --wait
• GET http://127.0.0.1:39100/healthz

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
glossa	Ignored	Preview	Aug 19, 2026 2:58pm

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📥 Commits

Reviewing files that changed from the base of the PR and between 0958189 and 6e43718.

📒 Files selected for processing (5)

• .dockerignore
• .github/workflows/ci.yml
• Dockerfile
• compose.yaml
• docs/self-hosting.md

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