GitHub Action workflow does not start when PR is created by GitHub Action

[HeavyWombat]

In case a PR is opened by a GitHub Action or GitHub itself, the workflows do not start. Examples can be found here, here, and here.

Reason is that this is implemented in such a way that there is no chance for infinite loops. See this issue for a discussion.

From GitHub Support:

This is a deliberate decision by the Actions team in order to prevent accidental "infinite loop" situations, and as an anti-abuse measure.
You will be able to work around this using a Personal Access Token in place of the provided token. As this needs to be explicitly provided it will remove any potential for possible abuse, so we recommend using this method when needing to create a pull request.

[SaschaSchwarze0]

Workarounds: https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#triggering-further-workflow-runs