fix: update GitHub release action and add setup instructions

- Update to softprops/action-gh-release@v2
- Add explicit token parameter
- Add comment with repository settings instructions

To resolve 422 error, repository admin needs to:
1. Go to Settings → Actions → General
2. Under 'Workflow permissions', select 'Read and write permissions'
3. Check 'Allow GitHub Actions to create and approve pull requests'

Author: michaelstonis

.github/workflows/publish.yml

@@ -96,9 +96,12 @@ jobs:
     
     - name: Create GitHub Release
       if: startsWith(github.ref, 'refs/tags/')
-      uses: softprops/action-gh-release@v1
+      uses: softprops/action-gh-release@v2
       with:
         files: ./artifacts/*.nupkg
         generate_release_notes: true
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        fail_on_unmatched_files: false
+        token: ${{ secrets.GITHUB_TOKEN }}
+      # Note: If this fails with 422 error, go to:
+      # Settings → Actions → General → Workflow permissions
+      # Select "Read and write permissions"