Things that need to be done to consider the move to Gerrit complete:
* [ ] create Query Builder Gerrit repo -> https://wikitech.wikimedia.org/wiki/Gerrit#Creating_new_repositories
* [ ] somehow figure out Cypress in CI (see T230729 for some prior work) and branch hosting, if needed
* [ ] create Jenkins test-job, it needs docker with nodejs?
* [ ] create Jenkins merge job?
* [ ] create mirror to https://github.com/wikimedia/query-builder/
* [ ] delete repo at https://github.com/wmde/query-builder/
* [ ] manually fix test-system to pull from Gerrit/gittiles instead of GitHub (though it could pull from the mirror)
* Alternatively: can Jenkins push after merge to toolforge and trigger the build script there? That would then be real CD for our CI... 馃ズ