Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-# Use the base Docker image
+# Use a suitable base Docker image with necessary dependencies
 FROM circulartextapp/spaceread
 
 # Set the working directory to /app
@@ -7,15 +7,19 @@ WORKDIR /app
 # Copy the current directory contents into the container at /app
 COPY . /app
 
-# Set up a new user named "user" dynamically
-RUN if id "user" >/dev/null 2>&1; then \
-      echo "User 'user' already exists."; \
+# Define the username in the environment variable USERNAME with a default value
+ARG USERNAME=default_user
+ENV USERNAME=$USERNAME
+
+# Check if the user already exists
+RUN if id "$USERNAME" >/dev/null 2>&1; then \
+      echo "User $USERNAME already exists."; \
     else \
-      useradd -m user; \
+      useradd -m -u 1000 -s /bin/bash "$USERNAME"; \
     fi
 
 # Set appropriate permissions for the application directory
-RUN chown -R user:user /app && chmod -R 755 /app
+RUN chown -R "$USERNAME":"$USERNAME" /app && chmod -R 755 /app
 
 # Install gosu (adjust the package manager based on your base image)
 RUN apt-get update && apt-get install -y gosu && rm -rf /var/lib/apt/lists/*
@@ -25,7 +29,7 @@ COPY entrypoint.sh /usr/local/bin/entrypoint.sh
 RUN chmod +x /usr/local/bin/entrypoint.sh
 
 # Switch to the user for improved security
-USER user
+USER "$USERNAME"
 
 # Define the entrypoint script to handle user creation and application startup
 ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]