Douglas Wilson authored Mar 18, 2021 and Matthew Pickering committed Jun 23, 2021

Since 58cfcc65 the default for jobs has been "interruptible", this means
that when new commits are pushed to a branch which already has a running
pipeline then the old pipelines for this branch are cancelled.

This includes the master branch, and in particular, new commits merged
to the master branch will cancel the nightly job.

The semantics of pipeline cancelling are actually a bit more complicated
though. The interruptible flag is *per job*, but once a pipeline has run
*any* non-interruptible job, then the whole pipeline is considered
non-interruptible (ref
https://gitlab.com/gitlab-org/gitlab/-/issues/32837

). This leads to the
hack in this MR where by default all jobs are `interruptible: True`, but
for pipelines we definitely want to run, there is a dummy job which
happens first, which is `interreuptible: False`. This has the effect of
dirtying the whole pipeline and preventing another push to master from
cancelling it.

For now, this patch solves the immediate problem of making sure nightly
jobs are not cancelled.
In the future, we may want to enable this job also for the master
branch, making that change might mean we need more CI capacity than
currently available.

[skip ci]

Ticket: #19554

Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>