docs: Add copilot-setup-steps.yml with mise installation

[Copilot]

Overview

This PR adds GitHub Copilot workspace setup configuration to automate the development environment setup for contributors. The configuration installs and configures mise, a modern polyglot tool version manager that replaces the need for manual tool installation.

Changes

New Files

1. .github/copilot-setup-steps.yml - GitHub Copilot workspace setup configuration that:

   • Installs mise via the official installation script
   • Configures mise activation in bash shell
   • Installs development tools (Terraform and Python) using mise
   • Sets up pre-commit hooks automatically

2. .tool-versions - Mise configuration file that specifies:

   • Terraform 1.5.7 (matches existing .terraform-version)
   • Python 3.10.8 (matches existing .python-version)

Benefits

• Automated Setup: Contributors get a fully configured development environment with a single setup command
• Version Management: mise ensures everyone uses the correct versions of Terraform and Python
• Consistency: Eliminates "works on my machine" issues by standardizing tool versions
• Efficiency: Reduces onboarding time for new contributors

How It Works

When GitHub Copilot workspace setup runs, it executes the steps defined in copilot-setup-steps.yml:

1. Downloads and installs mise
2. Configures mise in the bash environment
3. Reads .tool-versions and installs Terraform 1.5.7 and Python 3.10.8
4. Installs the pre-commit framework
5. Initializes pre-commit hooks for the repository

Contributors will have all necessary tools installed and ready to run pre-commit run -a and start contributing immediately.

Compatibility

This change is backward compatible and doesn't affect existing workflows or require any changes to the codebase. Developers can continue using their existing tool management approach, or opt-in to using mise for a more streamlined experience.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• mise.jdx.dev
  • Triggering command: curl -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Add copilot-setup-steps.yml to this repo and ensure it installs mise

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[baolsen]

@copilot Please use a mise.toml file for managing tool versions, and remove the other idiosyncratic version files from the repo. There should be 1 place where tool versions are defined, ie in the mise.toml