fix: 优化Dockerfile，简化用户添加步骤，移除不必要的groupadd和useradd命令

android-builder-docker/Dockerfile

@@ -24,9 +24,7 @@ RUN apt-get update \
     && apt-get install -y python2 python-mako python-is-python2 python-enum34 gettext
 
 
-RUN groupadd -g $groupid $username \
-    && useradd -m -u $userid -g $groupid $username \
-    && echo "$username ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers \
+RUN echo "$username ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers \
     && echo $username >/root/username \
     && echo "$username:$username" | chpasswd && adduser $username sudo