Add README with Docker setup instructions for self-hosting. Update
docker-compose.yml to use the pre-built registry image instead of
local build, and add a healthcheck against /api/health.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add multi-stage Dockerfile, docker-compose with persistent volumes,
and Gitea Actions workflows for CI (lint/test/build) and releases
(tag, Docker image push, changelog). Support DATABASE_PATH env var
for configurable SQLite location to enable proper volume mounting.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
