rust parser working on local build. fix docker build

Dockerfile

@@ -1,3 +1,12 @@
+# syntax=docker/dockerfile:1
+FROM rust:latest as rust-build
+WORKDIR /build
+COPY ./markdown_backend ./markdown_backend
+WORKDIR /build/markdown_backend
+RUN rustup target add x86_64-unknown-linux-musl
+RUN apt-get update && apt-get install -y musl-tools
+RUN cargo build --release --target x86_64-unknown-linux-musl
+
 FROM node:20
 
 WORKDIR /app
@@ -8,6 +17,9 @@ RUN npm install
 
 COPY . .
 
+# Copy the Rust binary from the build stage
+COPY --from=rust-build /build/markdown_backend/target/release/markdown_backend ./markdown_backend/target/release/markdown_backend
+
 RUN npm run build
 
 VOLUME ["/app/docker"]