fix(ci): Guard Codecov upload when token is unavailable

Author: seebeen

.github/workflows/tests.yml

@@ -54,13 +54,18 @@ jobs:
         run: composer test:unit
 
       - name: Upload coverage to Codecov
-        if: matrix.php == '8.1'
+        if: ${{ matrix.php == '8.1' && secrets.CODECOV_TOKEN != '' }}
         uses: codecov/codecov-action@v5
         with:
           files: build/coverage.xml
+          disable_search: true
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
 
+      - name: Skip Codecov upload (missing CODECOV_TOKEN)
+        if: ${{ matrix.php == '8.1' && secrets.CODECOV_TOKEN == '' }}
+        run: echo "Codecov upload skipped because CODECOV_TOKEN is not configured for this workflow context."
+
   integration-live:
     name: Integration (live RNIDS)
     runs-on: ubuntu-latest