• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

COPY mod/build-prereq.sh mod/requirements.txt "$SOFT/deepvariant-$DV_VERSION-src/"
should work because last argument ends with / inside quotes

Actual behavior

It throws error:
Dockerfile:48 DL3021 error: COPY with more than 2 arguments requires the last argument to end with /

Looks like it doesn't consider quotes because
COPY mod/build-prereq.sh mod/requirements.txt $SOFT/deepvariant-${DV_VERSION}-src/ is not throwing errors.