FROM docker.io/library/ubuntu:latest

# 安装开发工具（合并RUN层，减少镜像大小）
RUN apt-get update && apt-get install -y \
    build-essential gdb git\
    openssh-server \
    bash sudo \
    curl wget \
    ca-certificates \
    apt remove --purge curl -y && apt autoremove -y && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*