Add Demo docker image

[ildyria]

Summary by CodeRabbit

Release Notes

• New Features

  • Introduced a pre-configured Docker demo environment with sample user accounts and pre-loaded image galleries for quick evaluation and testing.

• Chores

  • Added Docker containerization and automated CI/CD infrastructure to support building and deploying the demo environment.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Introduces a new Docker-based demo workflow comprising a GitHub Actions pipeline to build and push a demo image, a Dockerfile that sets up a Lychee instance with seeded data, a docker-compose configuration for the demo stack, and a seeder script with reduced configuration defaults.

Changes

Cohort / File(s)	Summary
Docker CI/CD & Build .github/workflows/build-demo.yml, Dockerfile-demo	New workflow to build and push Docker demo images with QEMU/Buildx support, registry authentication, and caching. Dockerfile performs Lychee setup with database migrations, user creation, demo image downloads, and data seeding.
Demo Stack Configuration docker-compose.demo.yaml	Defines lychee_api service with hardened security settings (no-new-privileges, seccomp, capability constraints), volume mounts, healthchecks, environment configuration, and network setup for the demo environment.
Demo Seeder scripts/demo/DemoSeeder.php	Removes three configuration initializations: allow_online_git_pull, force_migration_in_production, and apply_composer_update from seeding defaults.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A demo takes shape with care and delight,
Docker and seeders and configs so tight,
CI pipelines building, containers all set,
The freshest of databases, no longer to fret!
Here's to the demo that hops into place! 🚀

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