Build processes generate files owned by root, causing CI failures

[ddohler]

Some parts of the build process generate files owned by root, which can cause CI failures of the form java.nio.file.FileSystemException: /var/jenkins/workspace/_climate-change-lab_develop-QNXQSJSLODPFZI7IZTCSAAHLXCTOOI6A464TUSAIWKD6VM2MJBJA/dist/_site/assets/sass/base/_animations.scss: Operation not permitted if Jenkins tries to clean up the workspace, because it doesn't have permission to delete these files. This is only an intermittent issue because Jenkins doesn't always try to clean the workspace. Manually SSHing into the Jenkins box and sudo rm -rf-ing the files solves the problem temporarily.