Dx/devcontainer codespaces

[BernardOnuh]

dx: add devcontainer for instant contributor onboarding

Closes #216

Summary

Adds a .devcontainer/devcontainer.json so any contributor can start coding immediately in a fully pre-configured environment — locally in VS Code or one-click via GitHub Codespaces. No manual toolchain setup required.

What's included

Config	Detail
Base image	mcr.microsoft.com/devcontainers/rust:1-bookworm (official MS devcontainer image)
Node.js	v20 via devcontainer feature
Rust	stable via devcontainer feature
Extensions	ESLint, Prettier, rust-analyzer, Prisma
Post-create	cp .env.example .env → npm install → cargo build (server + cli)
Port forwarding	3000 (API), 5173 (Frontend), 5432 (Postgres)

Acceptance criteria

• .devcontainer/devcontainer.json with Node v20 and Rust stable
• Pre-installed extensions: ESLint, Prettier, rust-analyzer, Prisma
• Post-create command runs npm install and cargo build
• .env.example copied to .env automatically on container creation

Implementation notes

• Uses the official MS devcontainer base image with layered features — no custom Dockerfile needed, keeping the setup minimal and maintainable
• .env copy uses cp -n (no-clobber) so it never overwrites an existing .env if the container is rebuilt
• remoteUser: vscode ensures the container runs as non-root, following devcontainer best practice
• editor.formatOnSave wired up with correct per-language formatters (Prettier for TS/JS, rust-analyzer for Rust)

How to test

GitHub Codespaces:

1. Go to https://github.com/BernardOnuh/fluid
2. Click Code → Codespaces → Create codespace on dx/devcontainer-codespaces
3. Wait for the container to build and the post-create command to finish
4. Verify node -v outputs v20.x, rustc --version outputs a stable version
5. Confirm .env exists and extensions are active in the sidebar

VS Code locally:

1. Clone the repo and open in VS Code
2. Install the Dev Containers extension
3. Run Reopen in Container from the command palette
4. Verify the same checks above

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[github-actions]

🎉 This PR is included in version 1.21.0 🎉

The release is available on GitHub release

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