Add Dockerfile and post-create script for development environment setup

Author: emmanuelknafo

.devcontainer/Dockerfile

@@ -0,0 +1,5 @@
+FROM mcr.microsoft.com/devcontainers/javascript-node:20
+
+# Install Charm freeze for terminal screenshots
+RUN curl -fsSL https://github.com/charmbracelet/freeze/releases/download/v0.1.6/freeze_0.1.6_linux_amd64.tar.gz \
+    | tar -xz -C /usr/local/bin freeze

.devcontainer/devcontainer.json

@@ -0,0 +1,28 @@
+{
+  "name": "Accessibility Scan Workshop",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers/features/azure-cli:1": {},
+    "ghcr.io/devcontainers/features/powershell:1": {}
+  },
+  "forwardPorts": [3000, 8001, 8002, 8003, 8004, 8005],
+  "postCreateCommand": "bash .devcontainer/post-create.sh",
+  "customizations": {
+    "vscode": {
+      "settings": {
+        "terminal.integrated.defaultProfile.linux": "pwsh"
+      },
+      "extensions": [
+        "ms-playwright.playwright",
+        "deque-systems.vscode-axe-linter",
+        "ms-azuretools.vscode-docker",
+        "GitHub.copilot"
+      ]
+    }
+  },
+  "remoteUser": "node"
+}

.devcontainer/post-create.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Clone the scanner repo alongside the workshop if not already present
+SCANNER_DIR="/workspaces/accessibility-scan-demo-app"
+if [ ! -d "$SCANNER_DIR" ]; then
+  gh repo fork devopsabcs-engineering/accessibility-scan-demo-app --clone --clone-dir "$SCANNER_DIR" 2>/dev/null \
+    || gh repo clone devopsabcs-engineering/accessibility-scan-demo-app "$SCANNER_DIR"
+fi
+
+# Install scanner dependencies and Playwright browser
+cd "$SCANNER_DIR"
+npm ci
+npx playwright install --with-deps chromium
+
+echo ""
+echo "=========================================="
+echo " Workshop environment ready!"
+echo " Scanner repo: $SCANNER_DIR"
+echo " Run ./start-local.ps1 to start the scanner"
+echo "=========================================="