Add dev container with optional Azure credentials and cross-platform support

[Copilot]

Implements development container configuration per commit 82b8f92 with fixes for cross-platform compatibility and optional credential persistence.

Changes

• .devcontainer/devcontainer.json: Node.js 20 container with Azure CLI, PowerShell, and GitHub CLI. No hardcoded mounts—Azure credentials are opt-in

• .devcontainer/README.md: Documents optional Azure credentials mount with platform-specific syntax ($HOME for Linux/Mac, $USERPROFILE for Windows). Fixed heading hierarchy (#### for manual command subsections)

• .devcontainer/dev.sh: Helper script for common workflows (check, build, test, validate)

• .devcontainer/EXAMPLES.md: Workflow examples for CI/CD integration

Platform-specific mount configuration

Users can optionally persist Azure credentials by adding to devcontainer.json:

// Linux/Mac
"mounts": ["source=${localEnv:HOME}/.azure,target=/home/node/.azure,type=bind,consistency=cached"]

// Windows  
"mounts": ["source=${localEnv:USERPROFILE}/.azure,target=/home/node/.azure,type=bind,consistency=cached"]

Default behavior: credentials not persisted between container rebuilds.

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:

• https://api.github.com/repos/Jury1981/login/commits/82b8f928c116378a71bef0ac79bae0c1cda7fa5e
  • Triggering command: /usr/bin/curl curl -s REDACTED (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

Reference: 82b8f92

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[github-actions]

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