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## Description
Fix “Resource not accessible by integration” error in greetings workflow
This PR updates the community | Greetings GitHub Actions workflow to
ensure it can successfully post greeting comments on newly opened issues
and pull requests — including PRs from forks — without hitting the
“Resource not accessible by integration” error.
## Changes
- Switched PR trigger from `pull_request` to `pull_request_target` to
run in the context of the base repository and grant write-scoped
`GITHUB_TOKEN` for commenting on forked PRs.
- Added explicit `permissions` block with:
- `issues: write`
- `pull-requests: write`
- Limited triggers to `types: [opened]` for both issues and PRs to avoid
unnecessary runs.
- Preserved existing greeting messages for issues and pull requests.
## Reason for change
The workflow was failing because the default `GITHUB_TOKEN` in
`pull_request` events is read-only for forks, preventing the bot from
posting comments.
`pull_request_target` with explicit permissions solves this while
maintaining security.
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.
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