ci: Use experimental-native-llb version of blubber
The native LLB version of Blubber is stable enough to dogfood with
RelEng projects. Let's eat.
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
The native LLB version of Blubber is stable enough to dogfood with
RelEng projects. Let's eat.