chore: update Dockerfile to clean up apt-get cache

This commit updates the Dockerfile to clean up the apt-get cache after installing clang and llvm. This helps reduce the size of the Docker image.

docker/Dockerfile

@@ -10,7 +10,10 @@ ENV TARGET_RUST_ARCH="x86_64-unknown-linux-musl"
 
 FROM base as builder-arm64
 ENV TARGET_RUST_ARCH="aarch64-unknown-linux-musl"
-RUN apt-get update && apt-get install clang llvm -y --no-install-recommends
+RUN apt-get update \
+    && apt-get install clang llvm -y --no-install-recommends \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 ENV CC_aarch64_unknown_linux_musl=clang
 ENV AR_aarch64_unknown_linux_musl=llvm-ar
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS="-Clink-self-contained=yes -Clinker=rust-lld"