[PR] fix: set explicit commitish for release-drafter to prevent PR failures [grails-core]

["jamesfredley (via GitHub)" <gi...@apache.org>]

jamesfredley opened a new pull request, #15524:
URL: https://github.com/apache/grails-core/pull/15524

   ## Summary
   
   - Fixes the `Release - Drafter` workflow failure visible on PRs like #15519
   - Addresses guidance from [INFRA-27602](https://issues.apache.org/jira/browse/INFRA-27602)
   
   ## Problem
   
   When the `release-notes.yml` workflow triggers on `pull_request` events, `release-drafter/release-drafter@v7` defaults `targetCommitish` to `refs/pull/NNN/merge` - a virtual merge ref that GitHub's API rejects as invalid for releases:
   
   ```
   ##[error]Validation Failed: {"resource":"Release","code":"invalid","field":"target_commitish"}
   ```
   
   This causes every PR to show a red check from the "Release - Drafter" workflow, even though the PR itself is fine.
   
   ## Fix
   
   Pass `commitish` explicitly so release-drafter always targets a valid branch:
   
   ```yaml
   with:
     commitish: ${{ github.event.pull_request.base.ref || github.ref_name }}
   ```
   
   This resolves correctly for all trigger types:
   
   | Trigger | `commitish` resolves to |
   |---------|------------------------|
   | `pull_request` to `7.0.x` | `7.0.x` (from `github.event.pull_request.base.ref`) |
   | `push` to `7.0.x` | `7.0.x` (from `github.ref_name`) |
   | `issues` | default branch (from `github.ref_name`) |
   | `workflow_dispatch` | selected branch (from `github.ref_name`) |
   
   The autolabeler continues to work on PR events as before - only the release draft target is fixed.


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Re: [PR] fix: resolve release-drafter failures on PRs and reduce API usage [grails-core]

["jamesfredley (via GitHub)" <gi...@apache.org>]

jamesfredley merged PR #15524:
URL: https://github.com/apache/grails-core/pull/15524


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