Workflow_run not triggered

In https://github.com/andig/evcc/pull/469/files I’m trying to migrate from travis to GH actions. I have 3 workflows where “docker” and “release” both depend on “build”.

The setup of the dependent workflows looks like this:

name: Docker
on:
  workflow_run:
    workflows:
    - Build
    types:
    - completed
    branches:
    - actions

Unfortunately, although “build” succeeds, the “docker” workflow is never triggered:

Any idea why the dependent “docker” flow doesn’t trigger?

Thanks!

Oh, stupid me. The answer is of course Actions dont't run in the PR first introducing them (I even wrote the answer). I must admit that this behaviour if confusing when you’re coming from TravisCI.