Update entrypoint.sh

Check `$DOCKER_USER` was defined before copying it to `$USER`.

Author: videlanicolas

ci/release-image/entrypoint.sh

@@ -5,16 +5,17 @@ set -eu
 # Otherwise the current container UID may not exist in the passwd database.
 eval "$(fixuid -q)"
 
-USER="$DOCKER_USER"
+if [ "${DOCKER_USER-}" ]; then
+  USER="$DOCKER_USER"
+  if [ "$DOCKER_USER" != "$(whoami)" ]; then
+    echo "$DOCKER_USER ALL=(ALL) NOPASSWD:ALL" | sudo tee -a /etc/sudoers.d/nopasswd >/dev/null
+    # Unfortunately we cannot change $HOME as we cannot move any bind mounts
+    # nor can we bind mount $HOME into a new home as that requires a privileged container.
+    sudo usermod --login "$DOCKER_USER" coder
+    sudo groupmod -n "$DOCKER_USER" coder
 
-if [ "${DOCKER_USER-}" ] && [ "$DOCKER_USER" != "$(whoami)" ]; then
-  echo "$DOCKER_USER ALL=(ALL) NOPASSWD:ALL" | sudo tee -a /etc/sudoers.d/nopasswd >/dev/null
-  # Unfortunately we cannot change $HOME as we cannot move any bind mounts
-  # nor can we bind mount $HOME into a new home as that requires a privileged container.
-  sudo usermod --login "$DOCKER_USER" coder
-  sudo groupmod -n "$DOCKER_USER" coder
-
-  sudo sed -i "/coder/d" /etc/sudoers.d/nopasswd
+    sudo sed -i "/coder/d" /etc/sudoers.d/nopasswd
+  fi
 fi
 
 dumb-init /usr/bin/code-server "$@"