chore: Simplify Dockerfile

Author: jhnsmth

Dockerfile

@@ -2,10 +2,7 @@
 FROM ekidd/rust-musl-builder:nightly AS builder
 
 # Add the source code.
-ADD . ./
-
-# Fix permissions on source code.
-RUN sudo chown -R rust:rust /home/rust
+COPY --chown=rust:rust . ./
 
 # Delete and re-install rustup in order to get the latest verison of Rust nightly.
 # This is necessary due to a bug in Rust: https://github.com/rust-lang-nursery/rustup.rs/issues/1239
@@ -14,17 +11,11 @@ RUN curl https://sh.rustup.rs -sSf | \
     sh -s -- -y && \
     rustup target add x86_64-unknown-linux-musl
 
-WORKDIR ~
-
 # Build the `tdb-server` application.
-RUN PKG_CONFIG_PATH=/usr/local/musl/lib/pkgconfig \
-    LDFLAGS=-L/usr/local/musl/lib \
-    cargo build --bin tdb-server --target x86_64-unknown-linux-musl --release
+RUN cargo build --bin tdb-server --release
 
 # Build the `tdb` application.
-RUN PKG_CONFIG_PATH=/usr/local/musl/lib/pkgconfig \
-    LDFLAGS=-L/usr/local/musl/lib \
-    cargo build --bin tdb --target x86_64-unknown-linux-musl --release
+RUN cargo build --bin tdb --release
 
 # Now, we need to build the _real_ Docker container, copying in `tdb-server`
 FROM alpine:latest