Simplify Dockerfile, remove superfluous steps

Removed unnecessary user creation and environment variable settings to reduce complexity. Preserved essential commands to maintain functionality and ensure the proper setup of the working directory and package installations. CMD at the end of the script is deleted and will be moved to devcontainer.json.

Dockerfile

@@ -1,16 +1,6 @@
 # Using the official Devbox image as the base
 FROM jetpackio/devbox:latest
 
-# Set the DEVBOX_USER environment variable
-ENV DEVBOX_USER=devbox-user
-
-# Ensure we are using root to perform operations that require elevated permissions
-USER root:root
-
-# Create a new user 'devbox-user' and ensure the user has appropriate permissions on the working directory
-RUN groupadd -r ${DEVBOX_USER} && \
-    useradd -r -g ${DEVBOX_USER} -d /code -s /bin/bash ${DEVBOX_USER}
-
 # Set up the working directory and permissions
 WORKDIR /code
 RUN mkdir -p /code && chown ${DEVBOX_USER}:${DEVBOX_USER} /code
@@ -23,6 +13,4 @@ COPY --chown=${DEVBOX_USER}:${DEVBOX_USER} devbox.json /code/devbox.json
 COPY --chown=${DEVBOX_USER}:${DEVBOX_USER} devbox.lock /code/devbox.lock
 
 # Run devbox command to install packages based on the lock file
-RUN devbox run -- echo "Installed Packages."
-
-CMD ["/bin/sh", "-c", "devbox shell && mvn spring-boot:run"]
+RUN devbox run -- echo "Installed Packages."