Update Dockerfile

Dockerfile

@@ -1,7 +1,7 @@
 # ------------------------------------------------------------------------------
-# 1. Builder Stage
+# 1. Builder Stage (Uses modern Rust 1.x stable with 2024 Edition support)
 # ------------------------------------------------------------------------------
-FROM rust:1.80-slim-bookworm AS builder
+FROM rust:1-slim-bookworm AS builder
 
 WORKDIR /app
 
@@ -17,7 +17,7 @@ RUN mkdir src && echo "fn main() {}" > src/main.rs
 RUN cargo build --release
 RUN rm -rf src
 
-# Copy real source files and compile binary
+# Copy real application source code and compile final binary
 COPY src ./src
 RUN touch src/main.rs && cargo build --release
 
@@ -32,15 +32,15 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
     && rm -rf /var/lib/apt/lists/*
 
-# Non-root user setup (UID 1000 for Hugging Face Spaces compatibility)
+# Non-root user setup (UID 1000 strictly required by Hugging Face Spaces)
 RUN useradd -m -u 1000 appuser
 
-# Prepare volume storage
+# Prepare writable storage directory for Tantivy indices
 RUN mkdir -p /data/index && chown -R appuser:appuser /data
 
 WORKDIR /app
 
-# Copy binary from builder
+# Copy compiled binary from builder
 COPY --from=builder /app/target/release/rust-mcp-search /usr/local/bin/rust-mcp-search
 
 ENV PORT=7860 \
@@ -49,6 +49,7 @@ ENV PORT=7860 \
     DATA_DIR=/data/index \
     RUST_LOG=info
 
+# Switch to non-root user
 USER 1000
 
 EXPOSE 7860