Fix Dockerfile not building

Cargo.toml

@@ -1,11 +1,3 @@
-# [package]
-# name = "markdown-extract-monorepo"
-# description = "Extract sections of a markdown file with a regular expression"
-# version = "0.1.0"
-# authors = ["Sean Bailey <hello@seanbailey.dev>"]
-# license = "MIT"
-# readme = "README.md"
-
 [workspace]
 members = ["crates/markdown-extract", "crates/markdown-extract-cli"]
 resolver = "2"

Dockerfile

@@ -1,27 +1,23 @@
 # Dockerfile for creating statically-linked Rust applications.
-# See: https://www.artificialworlds.net/blog/2020/04/22/creating-a-tiny-docker-image-of-a-rust-project/
-# See: https://alexbrand.dev/post/how-to-package-rust-applications-into-minimal-docker-containers/
 
-# 1: Build the exe
-FROM rust:1.57 as builder
+# Step 0: Initialise builder
+FROM rust:1.81 as builder
 WORKDIR /usr/src
+RUN rustup target add x86_64-unknown-linux-musl
+RUN apt-get update
+RUN apt-get install -y musl-tools gcc-x86-64-linux-gnu
+ENV RUSTFLAGS='-C linker=x86_64-linux-gnu-gcc'
 
-# 1a: Prepare for static linking
-RUN apt-get update && \
-    apt-get dist-upgrade -y && \
-    apt-get install -y musl-tools && \
-    rustup target add x86_64-unknown-linux-musl
-
-# 1b: Download and compile Rust dependencies (and store as a separate Docker layer)
-RUN USER=root cargo new markdown-extract
+# Step 1: Build and install binary
 WORKDIR /usr/src/markdown-extract
 COPY Cargo.toml Cargo.lock ./
-COPY src ./src
-RUN cargo install --target x86_64-unknown-linux-musl --path .
+COPY crates ./crates
+RUN cargo install \
+  --target x86_64-unknown-linux-musl \
+  --path ./crates/markdown-extract-cli
 
-# 2: Copy the exe and extra files ("static") to an empty Docker image
+# Step 2: Copy bin to an empty Docker image
 FROM scratch
 COPY --from=builder /usr/local/cargo/bin/markdown-extract .
-# COPY static .
 USER 1000
 ENTRYPOINT ["./markdown-extract"]