debug focused vterm renderer CI

Author: tninja

.github/workflows/unit-tests.yml

@@ -38,5 +38,5 @@ jobs:
             --eval "(progn (require 'package) (package-initialize))" \
             -l test/test_00-bootstrap.el \
             -l ert \
-            --eval "(mapc #'load-file (file-expand-wildcards \"test/test_*.el\"))" \
+            -l test/test_ai-code-backends-infra-vterm-renderer.el \
             -f ert-run-tests-batch-and-exit