feat: Implement a new layered architecture for the QR generator, integrating Axum, Maud, and HTMX, and updating documentation.

backend/Dockerfile

@@ -1,23 +1,40 @@
-FROM rust:1 AS chef 
-# We only pay the installation cost once, 
-# it will be cached from the second build onwards
+FROM rust:1-slim AS chef 
+
 RUN cargo install cargo-chef 
 WORKDIR /app
 
 FROM chef AS planner
 COPY . .
-RUN cargo chef prepare  --recipe-path recipe.json
+RUN cargo chef prepare --recipe-path recipe.json
 
 FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
-# Build dependencies - this is the caching Docker layer!
+# Build dependencies - this is the caching layer
 RUN cargo chef cook --release --recipe-path recipe.json
 # Build application
 COPY . .
-RUN cargo build --release --bin qr-generator
+RUN cargo build --release --bin k-qr
 
-# We do not need the Rust toolchain to run the binary!
+# Runtime stage
 FROM debian:bookworm-slim AS runtime
 WORKDIR /app
-COPY --from=builder /app/target/release/qr-generator /usr/local/bin
-ENTRYPOINT ["/usr/local/bin/qr-generator"]
+
+# Install necessary runtime dependencies (if any, usually none for static rust binaries)
+# Create a non-root user
+RUN groupadd -g 10001 appgroup && \
+    useradd -u 10001 -g appgroup appuser
+
+# Copy the binary from the builder stage
+COPY --from=builder /app/target/release/k-qr /usr/local/bin/k-qr
+
+# Set default environment variables
+ENV SERVER_HOST=0.0.0.0
+ENV SERVER_PORT=3000
+ENV RUST_LOG=k_qr=info
+
+# Use the non-root user
+USER appuser
+
+EXPOSE 3000
+
+ENTRYPOINT ["/usr/local/bin/k-qr"]