gitlab-ci: use `clang-tidy-cache`
This should vastly improve the throughput of tidy
jobs.
Backport: release
GitLab update will be applied on June 14th, between 8am and 10am, EDT (UTC-04:00). This site may have intermittent delays during that time.
This should vastly improve the throughput of tidy
jobs.
Backport: release