Fix CI workflow: add continue-on-error for Publish Test Results

The publish-unit-test-result-action fails with 403 Forbidden on PRs
because it lacks checks:write permission. This prevents the entire
build from being marked as successful even when tests pass.

Adding continue-on-error: true allows the actual build/test results
to be reported correctly while still attempting to publish test results.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: reidspencer

.github/workflows/scala.yml

@@ -87,6 +87,7 @@ jobs:
     - name: Publish Test Results
       uses: EnricoMi/publish-unit-test-result-action@v2
       if: always()
+      continue-on-error: true  # Prevent workflow failure from permissions issues on PRs
       with:
         files: |
           **/target/test-reports/*.xml