Run Dependabot YML Linter on PR too

[hfhbd]

Dependabot uses a yaml file for its settings. The linter for the yaml only runs on the main branch after a change, but not as a check during a PR request.
Please also run the linter in the PR request, to prevent merging invalide yaml configuration in the main branch.

Sample: hfhbd/routing-compose#9, no check and main ci with failing check https://github.com/hfhbd/routing-compose/runs/2791232493

[jurre]

Thanks for reporting this, it should definitely run on PRs as long as the config file is changed. I'm digging in trying to figure out why this isn't working.

[jeffwidman]

This is a dupe of #4605. Although this one is older, that one has more discussion, so closing this one.