Add Docker build script

docker-build.ps1

@@ -0,0 +1,51 @@
+# PowerShell script to build and push Docker image for Spelling Practice App
+
+# Set variables
+$IMAGE_NAME = "ghcr.io/nmemmert/spelling"
+$VERSION = (Get-Content -Path "version.json" | ConvertFrom-Json).version
+
+Write-Host "🔨 Building Docker image ${IMAGE_NAME}:${VERSION}..." -ForegroundColor Cyan
+
+# Build the image
+docker build -t ${IMAGE_NAME}:${VERSION} -t ${IMAGE_NAME}:latest .
+
+Write-Host "✅ Build completed." -ForegroundColor Green
+Write-Host "🧪 Testing the image..." -ForegroundColor Cyan
+
+# Run container for testing
+docker run --name spelling-test -d -p 3001:3000 ${IMAGE_NAME}:${VERSION}
+
+# Wait for container to start
+Start-Sleep -Seconds 5
+
+# Test health endpoint
+try {
+    $response = Invoke-WebRequest -Uri "http://localhost:3001/health" -UseBasicParsing
+    if ($response.StatusCode -eq 200) {
+        Write-Host "✅ Health check passed!" -ForegroundColor Green
+    } else {
+        Write-Host "❌ Health check failed with status $($response.StatusCode)" -ForegroundColor Red
+        docker logs spelling-test
+        docker stop spelling-test
+        docker rm spelling-test
+        exit 1
+    }
+} catch {
+    Write-Host "❌ Health check failed: $_" -ForegroundColor Red
+    docker logs spelling-test
+    docker stop spelling-test
+    docker rm spelling-test
+    exit 1
+}
+
+# Stop and remove test container
+docker stop spelling-test
+docker rm spelling-test
+
+Write-Host "📤 Pushing image to GitHub Container Registry..." -ForegroundColor Cyan
+docker push ${IMAGE_NAME}:${VERSION}
+docker push ${IMAGE_NAME}:latest
+
+Write-Host "🚀 Successfully built and pushed ${IMAGE_NAME}:${VERSION}" -ForegroundColor Green
+Write-Host "Press any key to exit..."
+$null = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")