chore(devcontainer): add multi-arch development container support

[Nikhil172913832]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes Setup Dev Containers #407) and the maintainers have approved on my working plan.

Summary

Adds Development Container configuration to provide a consistent development environment for contributors. Includes:

• .devcontainer/Containerfile with multi-architecture support (x86_64/amd64 and arm64)
• .devcontainer/devcontainer.json with VS Code extensions (Python, Pylance, Ruff) and settings
• .devcontainer/.dockerignore to optimize build performance
• Essential build tools: git, curl, wget, build-essential, libffi-dev, hatch
• Automatic setup: git submodule initialization and hatch environment creation

Breaking Changes

None.

Motivation

Development containers lower the barrier to contributions by providing a pre-configured environment with all necessary dependencies. This addresses issue #407 by:

• Eliminating manual setup for Python tooling and virtual environments
• Supporting both x86_64 and arm64 architectures
• Working seamlessly with GitHub Codespaces and VS Code Dev Containers
• Ensuring consistent development experience across all platforms

Test Plan

• Built container successfully for both amd64 and arm64 using docker buildx build --platform linux/amd64,linux/arm64
• Verified all dependencies install correctly (git, hatch, cffi, libffi-dev)
• Ran existing test suite to confirm no regressions:
  • tests/test_error.py: 6/6 tests passed
  • tests/test_util.py: 29/29 tests passed
  • tests/test_pact.py: 21/21 tests passed (1 skipped)
• Tested container functionality: Python 3.13, hatch commands, workspace mounting

Related issues/PRs

Closes #407

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51%. Comparing base (8e53032) to head (722aeb5).
✅ All tests successful. No failed tests found.

Additional details and impacted files

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  Coverage    51%     51%           
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  Files        31      31           
  Lines      3727    3727           
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  Hits       1936    1936           
  Misses     1791    1791           

Flag	Coverage Δ
tests	51% <ø> (ø)

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[Copilot]

Pull Request Overview

This PR adds Development Container configuration to provide a consistent development environment across all platforms. The implementation includes a multi-architecture Containerfile, VS Code-specific configuration with Python tooling (Ruff, Pylance, pytest), and build optimization through .dockerignore.

Key changes:

• Multi-arch development container based on Python 3.13-slim with essential build tools
• VS Code integration with Python extensions and formatting/linting settings
• Automated environment setup via postCreateCommand for git submodules and hatch

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
.devcontainer/Containerfile	Defines the container image with Python 3.13, build tools, and hatch installation via pipx
.devcontainer/devcontainer.json	Configures VS Code extensions, Python settings, workspace mount, and post-creation commands
.devcontainer/.dockerignore	Excludes development artifacts and cache directories from the container build context

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