Install Rust with custom paths and permissions

Dockerfile

@@ -7,8 +7,18 @@ RUN cargo build --release
 # Stage 2: Final minimal execution layer
 FROM debian:bookworm-slim
 RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
-RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
-ENV PATH="/root/.cargo/bin:${PATH}"
+
+# Set global installation paths BEFORE installing Rust
+ENV RUSTUP_HOME=/usr/local/rustup
+ENV CARGO_HOME=/usr/local/cargo
+ENV PATH="/usr/local/cargo/bin:${PATH}"
+
+# Install Rust (it will now install to the paths above)
+RUN curl --proto '=https' --tlsv1.2 -sSf https://rustup.rs | sh -s -- -y
+
+# Grant read and execute permissions to all users
+RUN chmod -R 755 /usr/local/cargo /usr/local/rustup
+
 WORKDIR /app
 COPY --from=builder /app/target/release/huffman-compression-rs /app/huffman-compression-rust
 ENTRYPOINT ["/app/huffman-compression-rust"]