Add Docker support, GitHub Actions CI, and project documentation

- Dockerfile: multi-stage build (SDK → ASP.NET 8), HTTP port 8080, volumes for media/data/logs
- .dockerignore: excludes build artifacts, local DB, and dev-only files
- .github/workflows/docker-publish.yml: builds and pushes to ghcr.io on main push
- docker-compose.example.yml: full stack with SQL Server 2022, healthcheck, named volumes
- .env.example: template for all required production environment variables
- README.md: project overview, local dev setup, Docker and Compose instructions
- CLAUDE.md: AI context file covering architecture, key dirs, config, CI/CD notes
- Ludero.Site/.gitignore: exclude appsettings.Development.json (contains credentials)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: voslucas

.dockerignore

@@ -0,0 +1,14 @@
+**/.git
+**/.vs
+**/.github
+**/bin
+**/obj
+**/Logs
+Ludero.Site/umbraco/Data
+Ludero.Site/wwwroot/media
+**/*.user
+**/*.suo
+.dockerignore
+docker-compose*.yml
+README.md
+CLAUDE.md

.env.example

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+# Copy this file to .env and fill in the values before running docker compose.
+# .env is excluded from git via .gitignore.
+
+# SQL Server sa password — min 8 chars, upper+lower+digit+symbol
+MSSQL_SA_PASSWORD=Change_Me_Str0ng!
+
+# Umbraco admin account created on first run
+UMBRACO_ADMIN_EMAIL=admin@example.com
+UMBRACO_ADMIN_PASSWORD=Change_Me_Str0ng!
+
+# Public base URL of the site (used for absolute link generation)
+SITE_URL=https://example.com

.github/workflows/docker-publish.yml

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+name: Build and publish Docker image
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=sha,prefix=sha-
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max