[skrause]

    RUN <<EOF
    foo
    bar
    EOF

https://www.docker.com/blog/introduction-to-heredocs-in-dock...

[yjftsjthsd-h]

Thanks, that helps a lot and I didn't know about it:) It's a touch less powerful than full transactions (because AFAICT you can't say merge a COPY and RUN together) but it's a big improvement.