# Minimal dash-in-a-box for sekft trajectory generation.
#   docker build -t sekft-dash .
#
# dash as the operated shell (strict POSIX, no bashisms), busybox applets for
# the coreutils.  busybox is intentionally close to minimal POSIX so trajectories
# transfer toward sek rather than encoding GNU-isms.  Add `coreutils findutils
# grep sed` here if you want GNU semantics instead.
FROM alpine:3.19
RUN apk add --no-cache dash \
 && ln -sf /usr/bin/dash /bin/dash \
 && ln -sf /usr/bin/dash /bin/sh
# /work is the default arena; provider files land at their absolute paths.
RUN mkdir -p /work
WORKDIR /work