feat: Add Dockerfile and Docker Compose configuration for containerized deployment and update README with instructions.

Dockerfile

@@ -0,0 +1,46 @@
+# Build Stage
+FROM rust:1.85-bookworm AS builder
+
+WORKDIR /app
+
+# Cache dependencies
+# We create a dummy project to build only dependencies
+RUN cargo new --bin blog_cms
+COPY Cargo.toml Cargo.lock ./
+RUN cargo build --release
+RUN rm src/*.rs
+
+# Copy real source
+COPY src ./src
+COPY templates ./templates
+
+# The templates are needed during compilation by askama
+# Rebuild the real source
+RUN touch src/main.rs && cargo build --release
+
+# Final Stage
+FROM debian:bookworm-slim
+
+WORKDIR /app
+
+# Install runtime dependencies (like SSL certificates and sqlite)
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    libsqlite3-0 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy the binary from the builder
+COPY --from=builder /app/target/release/blog_cms .
+
+# Create directory for attachments and database
+RUN mkdir -p attachments
+
+# Default environment variables
+ENV PORT=3000
+ENV DATABASE_URL=sqlite:///app/data.db
+
+# Expose the application port
+EXPOSE 3000
+
+# Start the application
+CMD ["./blog_cms"]