Add --codespace flag to init command for devcontainer.json generation

[Copilot]

Adds a --codespace flag to gh aw init that creates or updates .devcontainer/devcontainer.json with GitHub Codespace token permissions for the current repository and read access to githubnext/gh-aw releases.

Changes

• New flag: Added --codespace to init command
• Devcontainer management (pkg/cli/codespace_init.go):
  • Detects existing devcontainer.json in .devcontainer/ or repository root
  • Creates basic config with mcr.microsoft.com/devcontainers/universal:2 if none exists
  • Preserves all existing fields (name, features, customizations) using custom JSON marshaling
  • Merges permissions via mergePermissions() helper to avoid overwriting existing values
• Permission configuration:
  • Current repo (detected via GetCurrentRepoSlug()): write access for actions, contents, workflows, issues, pull requests, discussions
  • githubnext/gh-aw: read access for contents and metadata
• Tests: Comprehensive coverage for creation, updates, idempotency, and field preservation

Usage

gh aw init --codespace

Generates:

{
  "image": "mcr.microsoft.com/devcontainers/universal:2",
  "customizations": {
    "codespaces": {
      "repositories": {
        "owner/repo": {
          "permissions": {
            "actions": "write",
            "contents": "write",
            "workflows": "write",
            "issues": "write",
            "pull-requests": "write",
            "discussions": "write"
          }
        },
        "githubnext/gh-aw": {
          "permissions": {
            "contents": "read",
            "metadata": "read"
          }
        }
      }
    }
  }
}

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:

• go.googlesource.com
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
• go.uber.org
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
• gopkg.in
  • Triggering command: /update-job-proxy /update-job-proxy (dns block)
• https://api.github.com/user
  • Triggering command: /usr/bin/gh gh api user --jq .login (http 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 a flag "--codespace" to the "init" command that tries to optimize the setup for github codespaces.

• detect if a devcontainer.json file is present, if not create a basic one.
• added permissions for the codespace token to write actions

{
    "image": "mcr.microsoft.com/devcontainers/universal:2",
    "customizations": {
        "codespaces": {
            "repositories": {
                "OWNER/REPO: { # update
                    "permissions": {
                        "actions": "write",
                        "contents": "write",
                        "workflows": "write",
                        "issues": "write",
                        "pull-requests": "write",
                        "discussions": "write"
                    }
                }
            }
        }
    }
}

Also give permissions to read releases from the githubnext/gh-aw repository so that the extension can be downloaded in the future.

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