Fix subgroup cleanup job
Installs bundler, which was missing, e.g.: https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/799804
$ cd gitlab/qa/
$ bundle install
/bin/sh: eval: line 125: bundle: not found
Installs bundler, which was missing, e.g.: https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/799804
$ cd gitlab/qa/
$ bundle install
/bin/sh: eval: line 125: bundle: not found