[BUG] GitHub actions are duplicated for PRs generated on repo branches

[dbwiddis]

What is the bug?

Mend generates PRs using a branch on this repo, which triggers a push set of GitHub Actions.

When a PR is submitted from the branch, a pull_request set of GitHub Actions is also generated.

This duplicates effort.

How can one reproduce the bug?

Generate a PR from a branch on this repo, which Mend Renovate does. This is also a common scenario for repos with backports, which we don't have (yet).

What is the expected behavior?

One GHA run.

What is your host/environment?

GitHub Actions

Do you have any screenshots?

Do you have any additional context?

The proper solution is to exclude branches in the GHA. Sample PR after about 3 or 4 copypaste iterations of the same issue in other repos: opensearch-project/flow-framework#128