Fix Dockerfile to resolve build error

Dockerfile

@@ -13,9 +13,11 @@ RUN pip install --no-cache-dir --upgrade -r requirements.txt
 # Copy the entire project
 COPY . /app
 
-# Create user if it doesn't exist, then switch to it and pre-create log file
-RUN id -u user &>/dev/null || useradd -m -u 1000 user
-RUN mkdir -p /home/user && touch /home/user/app.log && chown user:user /home/user/app.log
+# Create user, directory, and log file with proper ownership in one step
+RUN useradd -m -u 1000 user && \
+    mkdir -p /home/user && \
+    touch /home/user/app.log && \
+    chown user:user /home/user/app.log
 USER user
 ENV HOME=/home/user \
     PATH=/home/user/.local/bin:$PATH