fix(ci): disable release draft update on PR events to prevent invalid target_commitish error

Release Drafter was failing on all PR events with:
  Error: Validation Failed - field 'target_commitish' is invalid

This happens because on PR events the target_commitish is set to
refs/pull/*/merge which is not a valid target for the GitHub Releases
API. The fix adds  when the event is a
pull_request, so the action still runs autolabeling on PRs but only
updates the draft release on push to main.

Author: Ritchie

.github/workflows/release-drafter.yml

@@ -33,9 +33,9 @@ jobs:
 
       # Drafts your next Release notes as Pull Requests are merged into "master"
       - uses: release-drafter/release-drafter@v7
-        # (Optional) specify config name to use, relative to .github/. Default: release-drafter.yml
-        # with:
-        #   config-name: my-config.yml
-        #   disable-autolabeler: true
+        # Only publish the draft on push to main; on PRs, only run autolabeler (no draft update).
+        # This prevents the "invalid target_commitish" error when target is refs/pull/*/merge.
+        with:
+          disable-releaser: ${{ github.event_name == 'pull_request' }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}