Simplify Dockerfile

Dockerfile

@@ -1,27 +1,11 @@
 # syntax=docker/dockerfile:1
 FROM --platform=linux/amd64 rust:bookworm AS builder
 
-ARG LLVM_VERSION=18
-ENV CC=clang-${LLVM_VERSION} CXX=clang-${LLVM_VERSION} CFLAGS="-flto -fuse-ld=lld-${LLVM_VERSION}" CXXFLAGS="-flto -fuse-ld=lld-${LLVM_VERSION}"
-
 WORKDIR /usr/src/myapp
-RUN echo "deb http://apt.llvm.org/bookworm/ llvm-toolchain-bookworm-${LLVM_VERSION} main" > /etc/apt/sources.list.d/llvm.list && \
-    wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc && apt-get update && \
-    apt-get install -y eatmydata && eatmydata apt-get install -y crossbuild-essential-arm64 clang-$LLVM_VERSION lldb-$LLVM_VERSION lld-$LLVM_VERSION clangd-$LLVM_VERSION && \
-    rm -rf /var/lib/apt/lists/*
-RUN rustup update && rustup toolchain install nightly && rustup target add --toolchain nightly aarch64-unknown-linux-gnu
 RUN --mount=type=bind,target=. --mount=type=cache,target=/root/.cargo cargo fetch
-ARG TARGETARCH
-RUN --mount=type=bind,rw,target=. --mount=type=cache,target=/root/.cargo --mount=type=cache,target=target,id=target-$TARGETARCH \
-    if [ "$TARGETARCH" = "arm64" ] ; then \
-        CARGO_HOST_LINKER=clang-${LLVM_VERSION} CARGO_HOST_RUSTFLAGS="-Clink-arg=-fuse-ld=lld-${LLVM_VERSION}" \
-        CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUSTFLAGS="-Clinker-plugin-lto -Clinker=clang-${LLVM_VERSION} -Clink-arg=-fuse-ld=lld-${LLVM_VERSION} -Clink-arg=--target=aarch64-unknown-linux-gnu" \
-        cargo +nightly -Ztarget-applies-to-host -Zhost-config install --target=aarch64-unknown-linux-gnu --path . ; \
-    else \
-        RUSTFLAGS="-Clinker-plugin-lto -Clinker=clang-${LLVM_VERSION} -Clink-arg=-fuse-ld=lld-${LLVM_VERSION}" cargo +nightly install --path . ; \
-    fi
+RUN --mount=type=bind,rw,target=. --mount=type=cache,target=/root/.cargo --mount=type=cache,target=target,id=target cargo install --path .
 
 FROM debian:bookworm-slim
 WORKDIR /hath
 COPY --from=builder /usr/local/cargo/bin/hath-rust /usr/local/bin/hath-rust
-CMD ["hath-rust"]
+ENTRYPOINT ["hath-rust"]