# main dependencies
FROM debian:bullseye AS s1
RUN set -ex \
    && apt-get update \
    && apt-get install -y \
    htop \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

FROM s1 AS s2
RUN set -ex \
    && touch /opt/123
    
FROM debian:bullseye
COPY --from=s2 / .
RUN ls /opt
RUN dpkg --list | grep htop