Add cloudrun dockerfile

[mashharuki]

This pull request introduces Docker support for the backend, updates the backend to be compatible with Google Cloud Run, and improves the development workflow. It also includes minor updates to the frontend service worker. Below is a breakdown of the most important changes:

Backend Dockerization and Cloud Run Compatibility

• Added a .dockerignore file to exclude unnecessary files like node_modules, .env, and .git from the Docker build context (pkgs/backend/.dockerignore).
• Created a Dockerfile for building and running the backend using Node.js 20, including dependency installation and application build steps (pkgs/backend/Dockerfile).
• Updated the backend to use the PORT environment variable for compatibility with Google Cloud Run (pkgs/backend/src/index.ts).

Documentation Enhancements

• Added a detailed README.md file with instructions for local development, Docker usage, and deployment to Google Cloud Run (pkgs/backend/README.md).

Development Workflow Improvements

• Added new npm scripts for building, running, and managing the backend with Docker (pkgs/backend/package.json).
• Enabled CORS in the backend to allow cross-origin requests (pkgs/backend/src/index.ts).
• Updated tsconfig.json to specify the output directory as dist and include all files in the src folder (pkgs/backend/tsconfig.json).

Frontend Updates

• Updated the service worker file to reflect new asset revisions, ensuring the latest versions of static files are served (pkgs/frontend/public/sw.js).

[Copilot]

Pull Request Overview

This PR adds Docker support and Cloud Run compatibility for the backend, enhances local development workflows, and updates the frontend service worker with new asset revisions.

• Dockerizes the backend with a new Dockerfile and .dockerignore
• Updates TypeScript and npm scripts to build, run, and deploy on Cloud Run
• Enables CORS and environment-based port configuration in the backend
• Adds detailed README for local development, Docker, and Cloud Run deployment
• Refreshes asset hashes in the frontend service worker

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pkgs/frontend/public/sw.js	Swapped loader variable names and updated static asset revisions
pkgs/backend/tsconfig.json	Set "outDir": "dist" and broadened "include" to src/**/*
pkgs/backend/src/index.ts	Added CORS middleware and made port configurable via PORT
pkgs/backend/package.json	Added build, start, docker:build, and docker:run scripts
pkgs/backend/README.md	New documentation for local, Docker, and Cloud Run workflows
pkgs/backend/Dockerfile	Dockerfile for building and running the backend
pkgs/backend/.dockerignore	Files to exclude from Docker build context

Comments suppressed due to low confidence (1)

pkgs/backend/src/index.ts:21

• [nitpick] This log runs before the server actually listens; consider removing or moving it after serve(...) to avoid confusion.

console.log("Server is running");

[Copilot]

Using a wildcard origin (*) with credentials: true is disallowed by browsers; either specify explicit origins or disable credentials.

Suggested change

	app.use(
	cors({
	origin: ["*"],
	const allowedOrigins = process.env.CORS_ALLOWED_ORIGINS
	? process.env.CORS_ALLOWED_ORIGINS.split(",")
	: [];
	app.use(
	cors({
	origin: allowedOrigins,

[Copilot]

[nitpick] Node.js 20 supports ES modules natively; you can simplify the start script to node ./dist/index.js and remove experimental flags.

Suggested change

	"start": "node --experimental-modules --es-module-specifier-resolution=node ./dist/index.js",
	"start": "node ./dist/index.js",

[Copilot]

The README maps port 8080, but the app and Dockerfile use port 4021; update one to keep them consistent.

Suggested change

	docker run -p 8080:8080 --env-file .env backend-api
	docker run -p 4021:4021 --env-file .env backend-api

[Copilot]

[nitpick] Installing @types/node inside the Dockerfile alters lockfiles; it's better to declare dev dependencies in package.json for consistency.