tristate driver test

.github/workflows/multi_tool.yaml

diff --git a/.github/workflows/multi_tool.yaml b/.github/workflows/multi_tool.yaml
index f8f205c..88717a7 100644
--- a/.github/workflows/multi_tool.yaml
+++ b/.github/workflows/multi_tool.yaml
@@ -99,6 +99,10 @@
     - name: docs
       run: python $HOME/multi_project_tools/multi_tool.py --generate-doc --openram --force
 
+    # test tristate driver
+    - name: tristate driver
+      run: python $HOME/multi_project_tools/multi_tool.py --test-tristate-driver
+
     # run the caravel test
     - name: caravel test
       run: python $HOME/multi_project_tools/multi_tool.py --test-caravel