ci: don't fail build when SonarQube scan step errors

The SonarQube scan runs as the final step of the test job and intermittently
returns HTTP 403 while downloading the scanner CLI from binaries.sonarsource.com,
failing the whole build even though tests passed. It is a reporting step and the
quality gate is reported via its own check, so mark it continue-on-error.

Author: firecow

.github/workflows/build.yml

@@ -84,6 +84,8 @@ jobs:
       - name: Run Tests
         run: bun run coverage
       - uses: sonarsource/sonarqube-scan-action@7006c4492b2e0ee0f816d36501671557c97f5995 # v8.1
+        # Reporting only; a transient scanner-download 403 must not fail the build. The quality gate is reported via its own check.
+        continue-on-error: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}