Run other GitHub action workflows after PR is created

[litetex]

The problem:

After the PR is created no other github actions are run

[litetex]

Found the same issue here: peter-evans/create-pull-request#48
→ https://github.com/peter-evans/create-pull-request/blob/master/docs/concepts-guidelines.md#triggering-further-workflow-runs

See also https://docs.github.com/en/actions/reference/events-that-trigger-workflows#example-using-multiple-events-with-activity-types-or-configuration

Note: You cannot trigger new workflow runs using the GITHUB_TOKEN. For more information, see "Triggering new workflows using a personal access token."