message: [gha][lbt] increase LBT timeout to 50min
  After recent changes to cluster-test, LSR and Vault are enabled by
  default. This has caused LBT to consistently either time out, or run
  very close to the existing 40 min timeout. Increasing this to 50 for
  now. Land this only when bors has been reconfigured.
  Closes:
diff: @@ -11,9 +11,9 @@ jobs:
  build-and-run-cluster-test:
  name: Build images and run cluster test
  runs-on: self-hosted
  - # NOTE the total time should cover build (~10 min) and test (~10 min).
  + # NOTE the total time should cover build (~10 min) and test (~20 min).
  # The additional time can cover the retries and wait.
  - timeout-minutes: 40
  + timeout-minutes: 50
  steps:
  - uses: actions/checkout@v1
  - name: Setup env
  