Update Dockerfile

Dockerfile

@@ -1,11 +1,9 @@
-# --- STAGE 1: Build Rust Backend (Using Nightly) ---
+# --- STAGE 1: Build Rust Backend (Nightly) ---
 FROM rustlang/rust:nightly-bookworm AS backend_build
 WORKDIR /app
 RUN apt-get update && apt-get install -y pkg-config libssl-dev
 COPY Cargo.toml ./
-# Build dependencies
 RUN mkdir src && echo "fn main() {}" > src/main.rs && cargo build --release
-# Build source
 COPY src ./src
 RUN touch src/main.rs && cargo build --release
 
@@ -19,6 +17,8 @@ RUN npm run build
 
 # --- STAGE 3: Final Runtime (Nix + Agent) ---
 FROM debian:bookworm-slim
+
+# 1. Install system dependencies as ROOT
 RUN apt-get update && apt-get install -y \
     curl xz-utils wget ca-certificates procps \
     libssl3 libasound2 libatk1.0-0 libc6 libcairo2 libcups2 \
@@ -30,18 +30,24 @@ RUN apt-get update && apt-get install -y \
     libxrandr2 libxrender1 libxss1 libxtst6 \
     && rm -rf /var/lib/apt/lists/*
 
-RUN useradd -m -u 1000 user
+# 2. Create the /nix directory as ROOT and give ownership to the HF user (1000)
+RUN mkdir -m 0755 /nix && useradd -m -u 1000 user && chown user /nix
+
+# 3. Switch to the non-root user
 USER user
 ENV HOME=/home/user
 WORKDIR /home/user
 
-# Install Nix
+# 4. Install Nix as the USER (it now has access to /nix)
 RUN curl -L https://nixos.org/nix/install | sh -s -- --no-daemon
 ENV PATH="/home/user/.nix-profile/bin:${PATH}"
 ENV NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz
 
+# 5. Copy built assets
 COPY --from=backend_build /app/target/release/polymorphic-agent .
 COPY --from=frontend_build /app/frontend/dist ./frontend/dist
+
+# 6. Create dynamic UI folder
 RUN mkdir -p ./frontend/src/dynamic
 
 EXPOSE 7860