install optimum from source

.github/workflows/test_openvino.yml

@@ -32,6 +32,7 @@ jobs:
         python -m pip install --upgrade pip
         # install PyTorch CPU version to avoid installing CUDA packages on GitHub runner without GPU
         pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu
+        pip install git+https://github.com/huggingface/optimum.git
         pip install .[openvino,openvino-tokenizers,nncf,tests,diffusers]
     - name: Test with Pytest
       run: |