Release improvements, take 2 (#440)

* Revert "Undo changes from #417"

* Do not remove .git folder

.circleci/config.yml

@@ -62,12 +62,9 @@ jobs:
           name: "package with packagecore"
           command: |
             # Clean up
-            rm -rf ./.git
             rm -rf ./dist/*
             # Pack source
-            cd ..
+            git archive -o ../${CIRCLE_PROJECT_REPONAME}-${CIRCLE_TAG}.tar.gz --format tar.gz --prefix=${CIRCLE_PROJECT_REPONAME}-${CIRCLE_TAG#v}/ ${CIRCLE_TAG}
-            tar -czf ${CIRCLE_PROJECT_REPONAME}-${CIRCLE_TAG}.tar.gz ${CIRCLE_PROJECT_REPONAME}
-            cd ${CIRCLE_PROJECT_REPONAME}
             # Use latest installed python3 from pyenv
             export PYENV_VERSION="$(pyenv versions | grep -Po '\b3\.\d+\.\d+' | tail -1)"
             pip install packagecore