fix: add cohere key to tests

.github/workflows/test.yml

@@ -48,6 +48,7 @@ jobs:
         env:
           PINECONE_API_KEY: ${{ secrets.PINECONE_API_KEY }}
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          COHERE_API_KEY: ${{ secrets.COHERE_API_KEY }}
         run: |
           make test
       - name: Upload coverage to Codecov