allow pr-comment.yml pull-requests: write

[chris48s]

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[github-actions]

This PR has been deployed.

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[chris48s]

Right. This fixes your GitHub actions build
Tbh, I still think this is a bit busted. Really the PR comment should happen after the staging deploy has succeeded, not before but.. lets stop pulling the thread there for this evening.

Lets review/merge this one first. Then I'll rebase #699 and #700 on this so they run the tests and do a staging deploy for you.

From memory, I can't remember if workflows with pull-requests: write will work on PRs from forks. If not, I'll re-push them as local branches (as we can see form this PR I still have push access to this repo).

[chris48s]

Replaced #699 and #700 with #702 and #703 but they're good to go