update dockerfile to use github and use slimmer image

Dockerfile

@@ -2,19 +2,19 @@
 FROM rust:1.81 AS builder
 
 # Install protobuf compiler
-RUN apt-get update && apt-get install -y protobuf-compiler
+RUN apt-get update && apt-get install -y protobuf-compiler git
 
 # Create a new directory for the application
 WORKDIR /app
 
-# Copy the entire project
-COPY . .
+# Clone the repository instead of copying local files
+RUN git clone https://github.com/lndk-org/lndk .
 
 # Build dependencies and the project
 RUN cargo build --release
 
 # Create a new stage with a minimal image
-FROM ubuntu:22.04 AS final
+FROM debian:bookworm-slim AS final
 
 # Install necessary runtime dependencies
 RUN apt-get update && \