🐳 Add devcontainer with pinned Rust toolchain and build dependencies

[Copilot]

Adds a fully reproducible Dev Container so contributors can start working immediately with zero manual setup — locally, in Codespaces, or in CI.

.devcontainer/Dockerfile

• Base: mcr.microsoft.com/devcontainers/base:ubuntu
• APT: pandoc, curl, git, build-essential, pkg-config, libssl-dev, ca-certificates
• Rust: stable toolchain via rustup, installed system-wide (/usr/local) with RUSTUP_HOME/CARGO_HOME/PATH via ENV
• Cargo tools: cross and cargo-watch (both --locked)
• Taskfile: v3.43.3 downloaded directly from the GitHub releases tarball (avoids executing a remote shell script)

.devcontainer/devcontainer.json

• Workspace mount targets /workspaces/renderflow
• Shell via terminal.integrated.defaultProfile.linux: "bash" (non-deprecated)
• Extensions: rust-analyzer, even-better-toml, vscode-docker
• postCreateCommand: "cargo fetch" pre-warms the dependency cache
• remoteUser: "vscode" aligned with the base image default

The following commands work out-of-the-box inside the container:

cargo build
cargo run -- build
cargo test
pandoc --version
task --version

Original prompt

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This section details on the original issue you should resolve

<issue_title>🐳 Create devcontainer with pinned toolchain and document build dependencies</issue_title>
<issue_description>### Title: 🐳 Create devcontainer with pinned toolchain and document build dependencies

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Description

Create a fully reproducible development environment using a Dev Container.

The environment should:

• start from Ubuntu
• install all required system dependencies
• install Rust toolchain (pinned)
• install Pandoc and document toolchain dependencies
• support immediate development with zero manual setup

This ensures consistent development across:

• local machines
• GitHub Codespaces
• CI environments

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Goals

• Provide a “ready-to-go” development environment
• Eliminate environment drift
• Pin versions for reproducibility
• Align local and CI environments

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Requirements

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1. DevContainer Structure

Create:

.devcontainer/
  devcontainer.json
  Dockerfile

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2. Base Image

Use Ubuntu-based image:

mcr.microsoft.com/devcontainers/base:ubuntu

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3. System Dependencies (APT)

Install required tools:

• pandoc
• curl
• git
• build-essential
• pkg-config
• libssl-dev
• ca-certificates

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Version Pinning

• Pin APT packages where possible
• Use explicit versions OR document exact versions installed

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4. Rust Toolchain Installation

Install Rust using rustup:

• install rustup via script
• install stable toolchain
• optionally pin toolchain version

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Requirements

• install rustc
• install cargo
• configure environment:

source "$HOME/.cargo/env"

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5. Additional Tooling

Install:

• cross (optional but recommended)
• cargo-watch (optional for dev UX)

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6. Taskfile Dependency

Install Taskfile:

• download from official release
• pin version using specific release URL or SHA

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7. Environment Configuration

Ensure:

• $HOME/.cargo/bin in PATH
• working directory is project root
• shell is bash

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8. DevContainer Configuration

In devcontainer.json:

• mount workspace
• set default shell
• enable extensions (optional)

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9. Validation

Ensure the following work inside container:

cargo build
cargo run -- build
cargo test
pandoc --version
task --version

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10. Copilot Guidance

• Prefer deterministic installs
• Pin versions where feasible
• Keep Dockerfile readable
• Avoid unnecessary layers or complexity
• Ensure fast rebuild times

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Acceptance Criteria

• DevContainer builds successfully
• All dependencies installed correctly
• Rust toolchain available
• Pandoc available
• Taskfile installed
• Project builds inside container
• CLI runs successfully
• Environment is reproducible

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Notes

This container becomes the canonical development environment for Renderflow.

Future CI pipelines should mirror this setup.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 🐳 Create devcontainer with pinned toolchain and document build dependencies #52

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