Dockerfile: standardize artefact paths for intermediate stages #36414
Description
#35100 rewrote the Dockerfile to use multi-stage builds. Some review-comments were left.
A minor enhancement/cleanup: see #35100 (comment)
Can we standardise on an output path for artefacts? e.g. make all the build-stages output artefacts in (say) /output/, then we can simplify all these to
COPY --from=foo /output/ /usr/local/bin/
COPY --from=bar /output/ /usr/local/bin/
COPY --from=baz /output/ /usr/local/bin/
COPY --from=bif /output/ /usr/local/bin/