Add Docker support

Docker configuration:
- Dockerfile: Multi-stage build with non-root user, health checks
- Dockerfile.migrations: Runs EF Core migrations on startup
- docker-compose.yml: Full stack with SQL Server, Azurite, app
- .dockerignore: Optimized build context
- .env.example: Template for API keys

Application changes:
- Added /health endpoint with EF Core database check
- Conditional HTTPS redirect (disabled in containers)
- DOTNET_RUNNING_IN_CONTAINER environment detection

Usage:
  cp .env.example .env  # Add your API keys
  docker-compose up -d  # Start all services

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,54 @@
+# Build stage
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+
+# Copy solution and project files first for better layer caching
+COPY TrueCV.sln ./
+COPY src/TrueCV.Domain/TrueCV.Domain.csproj src/TrueCV.Domain/
+COPY src/TrueCV.Application/TrueCV.Application.csproj src/TrueCV.Application/
+COPY src/TrueCV.Infrastructure/TrueCV.Infrastructure.csproj src/TrueCV.Infrastructure/
+COPY src/TrueCV.Web/TrueCV.Web.csproj src/TrueCV.Web/
+
+# Restore dependencies
+RUN dotnet restore
+
+# Copy all source code
+COPY src/ src/
+
+# Build and publish
+WORKDIR /src/src/TrueCV.Web
+RUN dotnet publish -c Release -o /app/publish --no-restore
+
+# Runtime stage
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS runtime
+WORKDIR /app
+
+# Install curl for health checks
+RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user for security
+RUN groupadd -r truecv && useradd -r -g truecv truecv
+
+# Copy published app
+COPY --from=build /app/publish .
+
+# Set ownership
+RUN chown -R truecv:truecv /app
+
+# Switch to non-root user
+USER truecv
+
+# Expose port
+EXPOSE 8080
+
+# Set environment variables
+ENV ASPNETCORE_URLS=http://+:8080
+ENV ASPNETCORE_ENVIRONMENT=Production
+ENV DOTNET_RUNNING_IN_CONTAINER=true
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:8080/health || exit 1
+
+# Start the app
+ENTRYPOINT ["dotnet", "TrueCV.Web.dll"]