Dangerfile: warn if Distribution label missing

Warn in CI if ~Distribution label is missing from MR, ensure that
gitlab-insights picks up work.

Signed-off-by: Jason Plum <jplum@gitlab.com>
16 jobs for dangerfile-warn-missing-label in 41 minutes and 32 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Prepare
passed #205175804
check_docs_internal_links

00:00:36

passed #205310549
danger-review

00:00:15

passed #205309502
danger-review

00:00:57

passed #205175800
danger-review

00:00:19

 
  Review
passed #205175809
review_eks

00:04:38

passed #205175806
review_gke

00:06:10

passed #205175814
allowed to fail manual
stop_review_eks

00:00:27

passed #205175812
allowed to fail manual
stop_review_gke

00:00:43

 
  Specs
passed #205175818
review_specs_eks

00:06:50

passed #205175815
review_specs_gke

00:09:16

 
  Qa
skipped #205175828
debug_review
passed #205175843
allowed to fail
qa_eks

00:09:34

failed #205191338
allowed to fail
qa_gke

00:14:18

passed #205175823
review_helm_test

00:00:40

failed #205175841
allowed to fail
qa_gke

00:13:56

 
  Package
passed #205175845
lint_package

00:00:38

 
Name Stage Failure
failed
qa_gke Qa
rspec ./qa/specs/features/browser_ui/3_create/merge_request/view_merge_request_diff_patch_spec.rb:16 # Create Download merge request patch and diff user views merge request email patches
rspec ./qa/specs/features/browser_ui/3_create/merge_request/view_merge_request_diff_patch_spec.rb:25 # Create Download merge request patch and diff user views merge request plain diff

Randomized with seed 42747

Uploading artifacts...
./gitlab-qa-run-*: found 10 matching files
Uploading artifacts to coordinator... ok
id=205191338 responseStatus=201 Created token=2yzsdVWs
ERROR: Job failed: exit code 1