Fix Dockerfile user creation and permissions

Dockerfile

@@ -2,24 +2,33 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install Java
+# 1. Install System Dependencies (Java for LanguageTool, Build tools for safety)
 RUN apt-get update && \
-    apt-get install -y openjdk-17-jdk-headless && \
+    apt-get install -y openjdk-17-jdk-headless build-essential git && \
     rm -rf /var/lib/apt/lists/*
 
-# Copy files
+# 2. Copy files
 COPY . .
 
-# Install dependencies
-RUN pip install --no-cache-dir -r requirements.txt
+# 3. Install Python libraries
+# We add --verbose to see errors if pip fails
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
 
-# Setup user permissions (HF Security Requirement)
-RUN useradd -m -u 1000 user
+# 4. Create User (Robust Version)
+# Checks if user exists; if not, creates it. Handles existing ID 1000.
+RUN id -u user &>/dev/null || useradd -m -u 1000 user
+
+# 5. Fix Permissions
+# Ensure the new user owns the app directory and home directory
+RUN chown -R user:user /app && \
+    chown -R user:user /home/user
+
+# 6. Switch to User
 USER user
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH
 
+# 7. Run
 EXPOSE 7860
-
-# Run Streamlit on port 7860
 CMD ["streamlit", "run", "app.py", "--server.port=7860", "--server.address=0.0.0.0"]