testflight: prevent pipeline from getting GC'd
testflight: prevent pipeline from getting GC'd

Since we were calling `set_pipeline: self` but removing the job that set
the pipeline initially,  the pipeline would occasionally get archived
prior to triggering the "normal-job" job. This would cause fly to hang
forever since archived pipelines are effectively paused.

Signed-off-by: Aidan Oldershaw <30ef7a6e0d016bc846f26d89dacbd23aceded206@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse