chore: setup docker

[Nanahuse]

• publish pull request container image
• redesign container

[Copilot]

Pull request overview

This PR establishes Docker containerization for the racebot project, enabling both development and production deployment workflows. It introduces a multi-stage Dockerfile, GitHub Actions workflows for automated image publishing, and updates the development container configuration to leverage the new unified Dockerfile structure.

Key changes:

• Multi-stage Dockerfile with base, runtime, and dev targets for different use cases
• GitHub Actions workflows for publishing container images on PR and main branch pushes
• Consolidated devcontainer setup using the main Dockerfile instead of a separate devcontainer Dockerfile
• Added Ruff linter configuration to pyproject.toml

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
Dockerfile	Introduces multi-stage build with base, runtime, and dev images using uv package manager
.github/workflows/publish-pr.yml	Workflow to build and push experimental PR container images to GHCR
.github/workflows/publish-main.yml	Workflow to build and push versioned and latest container images on main branch
.devcontainer/devcontainer.json	Updated to use main Dockerfile's dev target instead of separate devcontainer Dockerfile
.devcontainer/scripts/copy_auth.sh	Script to copy SSH credentials from host to container for authentication
.devcontainer/Dockerfile	Removed in favor of unified Dockerfile
pyproject.toml	Added Ruff linter configuration with line length and rule selections
README.md	Added docker-compose.yaml example and Japanese description
.gitignore	Added uv cache and venv directories
LICENSE	Formatting change (no content modification)

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