establish staging workflow for static sites in GitLab CI
in the rush migration surrounding tpo/tpa/team#40501 (closed), we moved the main prod websites, but not the staging sites. figure out how those work in GitLab CI and migrate them.
in the rush migration surrounding tpo/tpa/team#40501 (closed), we moved the main prod websites, but not the staging sites. figure out how those work in GitLab CI and migrate them.