Update nightly.yml

.github/workflows/nightly.yml

@@ -44,7 +44,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
+        python -m pip install flake8 pytest yapf toml
         if [ -f requirements.txt ]; then pip install -r requirements.txt --extra-index-url https://download.pytorch.org/whl/nightly/cpu  -f https://github.com/llvm/torch-mlir/releases -f https://github.com/nod-ai/SHARK-Runtime/releases; fi
     - name: Lint with flake8
       run: |
@@ -52,6 +52,7 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude lit.cfg.py
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude lit.cfg.py
+        yapf -i --style .style.yapf shark/*.py
     - name: Validate Models
       run: |
         cd $GITHUB_WORKSPACE