Changes

Dockerfile

@@ -35,11 +35,13 @@ RUN useradd -m -s /bin/bash admin && \
     usermod -aG sudo admin && \
     echo "admin:password" | sudo chpasswd && \
     echo "admin ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers 
-    
-RUN useradd -m -s /bin/bash ubuntu && \
+
+RUN id -u ubuntu &>/dev/null || useradd -m -s /bin/bash ubuntu && \
     usermod -aG sudo ubuntu && \
-    echo "ubuntu:password" | sudo chpasswd && \
+    echo "ubuntu:password" | chpasswd && \
     echo "ubuntu ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+    
+RUN echo "password" | su - ubuntu -c "whoami"
 
 # Copy the application code to the container
 COPY . /app