make --no-cache optional

Docker/build.sh

 #sh!/bin/bash -ex 
 tag=$1
+shift
 test -n "$tag"
 git diff $tag
 # git rev-parse --short ${TAG}
 hash=$(git rev-parse --short HEAD)
 echo building rGIT${hash}
 sleep 1
-docker build --no-cache --build-arg BORT=${tag} . -f shellb3-cspp-py38.Dockerfile \
+docker build "$@" --build-arg BORT=${tag} . -f shellb3-cspp-py38.Dockerfile \
   -t shellb3-cspp-py38:latest \
   -t gitlab.ssec.wisc.edu:5555/cspp/buildbucket/shellb3/shellb3-centos7-gcc8-cspp-py38:rGIT${hash} \
   -t gitlab.ssec.wisc.edu:5555/cspp/buildbucket/shellb3/shellb3-centos7-gcc8-cspp-py38:latest