Add extra index url in tests requirements install

Author: sbettid

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        if [ -f requirements.txt ]; then pip install --extra-index-url https://google-coral.github.io/py-repo/ -r requirements.txt; fi
     - name: Test with pytest
       run: |
         pytest