feat: add comprehensive CI/CD pipeline and Docker support

Dockerfile

@@ -0,0 +1,53 @@
+# Use multi-stage build for smaller final image
+FROM rust:1.75-slim as builder
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy manifests
+COPY Cargo.toml Cargo.lock ./
+COPY ghost-core/Cargo.toml ghost-core/
+COPY ghost-cli/Cargo.toml ghost-cli/
+
+# Create dummy source files to build dependencies
+RUN mkdir ghost-core/src ghost-cli/src && \
+    echo "fn main() {}" > ghost-cli/src/main.rs && \
+    echo "" > ghost-core/src/lib.rs
+
+# Build dependencies
+RUN cargo build --release && \
+    rm -rf ghost-core/src ghost-cli/src target/release/deps/ghost*
+
+# Copy source code
+COPY ghost-core/src ghost-core/src/
+COPY ghost-cli/src ghost-cli/src/
+
+# Build application
+RUN cargo build --release --bin ghost-cli
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN useradd -r -s /bin/false ghost
+
+# Copy binary
+COPY --from=builder /app/target/release/ghost-cli /usr/local/bin/ghost
+
+# Set ownership and permissions
+RUN chown root:root /usr/local/bin/ghost && \
+    chmod 755 /usr/local/bin/ghost
+
+USER ghost
+
+ENTRYPOINT ["/usr/local/bin/ghost"]