Action: Fix milestone tagging not working for community PRs #1278
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Reference issue: WordPress/gutenberg#17324 (comment)
Because the GitHub Action runs on our repository, it doesn't have permission to modify a community pull request, as those belong to the original forked repository.
This PR solves that by running the Action in the context of the original repository, by triggering from the
pull_request_target
event, instead ofpull_request
.