branch_off_tag_and_re_tag.sh

# assuming your tag is '1.0.1'

# ensure latest code is local
git fetch --all --tag

# create branch off tag
git checkout -b branch-off-1.0.1 1.0.1
   # your current branch should now be 'branch-off-1.0.1'

# ensure branch matches tag [optional]
git diff 1.0.1

# now make your changes and do all the fun stuff

# tag your branch for release with next tag in line (e.g. 1.0.2)
git tag 1.0.2

# push tags
git push --tags