ci: fix preview URLs on dependabot/forks #1327
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Motivation / Description / Changes introduced
Both forks and dependabot don't create preview URLs.
Add explicit permissions plus use
pull_request_targetto allow writing from forks.pull_request_target runs in the context of the base branch, so can be unsafe if you check out code from the fork, therefore running untrusted code with secrets/other access available to GitHub Actions.
Since we're only adding an annotation, this is safe.
Links to discussion, or Linear ticket (if applicable)
Additional comments