Try to fix user-related issues.

Dockerfile

@@ -10,24 +10,21 @@ RUN apt-get -y update && apt-get -y install python3-pip
 
 RUN cat /etc/passwd
 
-# Set up a new user named "user"
-RUN useradd -m -o -u 1000 user
-
 # Switch to the "user" user
-USER user
+USER ubuntu
 
 RUN pip3 install --break-system-packages --no-cache-dir --upgrade setuptools pip
 
 RUN pip3 install --break-system-packages --no-cache-dir --upgrade -r /code/requirements.txt
 
 # Set home to the user's home directory
-ENV HOME=/home/user \
-    PATH=/home/user/.local/bin:$PATH
+ENV HOME=/home/ubuntu \
+    PATH=/home/ubuntu/.local/bin:$PATH
 
 # Set the working directory to the user's home directory
 WORKDIR $HOME/app
 
 # Copy the current directory contents into the container at $HOME/app setting the owner to the user
-COPY --chown=user . $HOME/app
+COPY --chown=ubuntu . $HOME/app
 
 CMD ["python3", "app.py"]