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+FROM ubuntu:22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV TERM=xterm-256color
+
+# -------------------------
+# Base packages
+# -------------------------
+RUN apt-get update && apt-get install -y \
+    bash \
+    curl \
+    wget \
+    git \
+    nano \
+    vim \
+    htop \
+    ca-certificates \
+    sudo \
+    gnupg \
+    lsb-release \
+    unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# -------------------------
+# Python
+# -------------------------
+RUN apt-get update && apt-get install -y \
+    python3 \
+    python3-pip \
+    python3-venv \
+    && rm -rf /var/lib/apt/lists/*
+
+# -------------------------
+# Node.js (LTS)
+# -------------------------
+RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y nodejs
+
+# -------------------------
+# Go
+# -------------------------
+RUN wget https://go.dev/dl/go1.22.0.linux-amd64.tar.gz \
+    && tar -C /usr/local -xzf go1.22.0.linux-amd64.tar.gz \
+    && rm go1.22.0.linux-amd64.tar.gz
+
+ENV PATH="/usr/local/go/bin:${PATH}"
+
+# -------------------------
+# Docker CLI (NO daemon)
+# -------------------------
+RUN curl -fsSL https://get.docker.com | sh \
+    && rm -rf /var/lib/apt/lists/*
+
+# -------------------------
+# Install ttyd
+# -------------------------
+RUN wget https://github.com/tsl0922/ttyd/releases/download/1.7.7/ttyd.x86_64 \
+    -O /usr/local/bin/ttyd \
+    && chmod +x /usr/local/bin/ttyd
+
+# -------------------------
+# User (ephemeral session)
+# -------------------------
+RUN useradd -m terminal \
+    && echo "terminal ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+# -------------------------
+# Welcome banner
+# -------------------------
+COPY banner.txt /etc/banner.txt
+
+RUN echo 'cat /etc/banner.txt' >> /etc/bash.bashrc && \
+    echo 'cd /tmp' >> /etc/bash.bashrc
+
+# -------------------------
+# Session cleanup on exit
+# -------------------------
+RUN echo 'rm -rf /tmp/*' >> /etc/bash.bashrc
+
+USER terminal
+WORKDIR /tmp
+
+EXPOSE 7860
+
+# -W = close session when browser disconnects
+CMD ["ttyd", "-p", "7860", "-W", "bash"]