Add GitHub Actions workflow for Docker builds

Triggers on release tags (v*) and manual dispatch
Builds and pushes to GitHub Container Registry
Tags with both version and latest
Uses build caching for faster builds

.github/workflows/docker-release.yml

@@ -0,0 +1,52 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    tags:
+      - 'v*'  # Triggers on v1.0.0, v2.1.3, etc.
+  workflow_dispatch:  # Manual trigger option
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract version from tag
+        id: meta
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/v}
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "Building version: $VERSION"
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository_owner }}/ai-trader:${{ steps.meta.outputs.version }}
+            ghcr.io/${{ github.repository_owner }}/ai-trader:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Image published
+        run: |
+          echo "✅ Docker image published successfully!"
+          echo "📦 Pull with: docker pull ghcr.io/${{ github.repository_owner }}/ai-trader:${{ steps.meta.outputs.version }}"
+          echo "📦 Or latest: docker pull ghcr.io/${{ github.repository_owner }}/ai-trader:latest"