chore: add devcontainer support to ease developer workstation setup

Fixes #466

.devcontainer/devcontainer.json

@@ -0,0 +1,58 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/python
+{
+	"name": "SpecKitDevContainer",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/python:3.13-trixie", // based on Debian "Trixie" (13)
+	"features": {
+		"ghcr.io/devcontainers/features/common-utils:2": {
+			"installZsh": true,
+			"installOhMyZsh": true,
+			"installOhMyZshConfig": true,
+			"upgradePackages": true,
+			"username": "devcontainer",
+			"userUid": "automatic",
+			"userGid": "automatic"
+		},
+		"ghcr.io/devcontainers/features/dotnet:2": {
+			"version": "lts"
+		},
+		"ghcr.io/devcontainers/features/git:1": {
+			"ppa": true,
+			"version": "latest"
+		}
+	},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [
+	8080 // for Spec-Kit documentation site
+  ],
+  "containerUser": "devcontainer",
+  "updateRemoteUserUID": true,
+  "postCreateCommand": "chmod +x ./.devcontainer/post-create.sh && ./.devcontainer/post-create.sh",
+  "postStartCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+		"mhutchie.git-graph",
+		"eamodio.gitlens",
+		"anweber.reveal-button",
+		"chrisdias.promptboost",
+		// Github Copilot
+		"GitHub.copilot",
+		"GitHub.copilot-chat",
+		// Codex
+		"openai.chatgpt",
+		// Kilo Code
+		"kilocode.Kilo-Code",
+		// Roo Code
+		"RooVeterinaryInc.roo-cline",
+		// Amazon Developer Q
+		"AmazonWebServices.amazon-q-vscode"
+	],
+      "settings": {
+		"debug.javascript.autoAttachFilter": "disabled" // fix running commands in integrated terminal
+      }
+    }
+  }
+}

.devcontainer/post-create.sh

@@ -0,0 +1,85 @@
+#!/bin/bash
+
+# Exit immediately on error, treat unset variables as an error, and fail if any command in a pipeline fails.
+set -euo pipefail
+
+# Function to run a command and show logs only on error
+run_command() {
+    local command_to_run="$*"
+    local output
+    local exit_code
+    
+    # Capture all output (stdout and stderr)
+    output=$(eval "$command_to_run" 2>&1) || exit_code=$?
+    exit_code=${exit_code:-0}
+    
+    if [ $exit_code -ne 0 ]; then
+        echo -e "\033[0;31m[ERROR] Command failed (Exit Code $exit_code): $command_to_run\033[0m" >&2
+        echo -e "\033[0;31m$output\033[0m" >&2
+        
+        return $exit_code
+    fi
+}
+
+# Note: We use Bun (instead of npm) as our package manager for its speed and overall efficiency
+# It is a drop-in replacement for Node.js, so we can install npm packages through it without issues
+echo "📦 Installing Bun Package Manager..."
+run_command "curl -fsSL https://bun.sh/install | bash"
+run_command "source ~/.bashrc"
+echo "✅ Done"
+
+export BUN_INSTALL="$HOME/.bun"
+export PATH="$BUN_INSTALL/bin:$PATH"
+
+# Installing CLI-based AI Agents
+
+echo -e "\n🤖 Installing Copilot CLI..."
+run_command "bun add --global @github/copilot@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Claude CLI..."
+run_command "bun add --global @anthropic-ai/claude-code@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Codex CLI..."
+run_command "bun add --global @openai/codex@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Gemini CLI..."
+run_command "bun add --global @google/gemini-cli@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Augie CLI..."
+run_command "bun add --global @augmentcode/auggie@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Qwen Code CLI..."
+run_command "bun add --global @qwen-code/qwen-code@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing OpenCode CLI..."
+run_command "bun add --global opencode-ai@latest"
+echo "✅ Done"
+
+echo -e "\n🤖 Installing Amazon Developer Q CLI..."
+run_command "curl --proto '=https' --tlsv1.2 -sSf \"https://desktop-release.q.us-east-1.amazonaws.com/latest/q-x86_64-linux.zip\" -o \"q.zip\""
+run_command "unzip q.zip && rm q.zip"
+run_command "./q/install.sh --no-confirm"
+run_command "rm -rf ./q"
+echo "✅ Done"
+
+# Installing UV (Python package manager)
+echo -e "\n🐍 Installing UV - Python Package Manager..."
+run_command "pipx install uv"
+echo "✅ Done"
+
+# Installing DocFx (for documentation site)
+echo -e "\n📚 Installing DocFx..."
+run_command "dotnet tool update -g docfx"
+echo "✅ Done"
+
+echo -e "\n🧹 Cleaning cache..."
+run_command "sudo apt-get autoclean"
+run_command "sudo apt-get clean"
+
+echo "✅ Setup completed. Happy coding! 🚀"