bau: run don't source pre-commit.sh in jenkins.sh
bau: run don't source pre-commit.sh in jenkins.sh

Authors: 13c805d2b1cb1b7e2ef8e794a6a5b47c193b59c5@chrisholmes

alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend