fix github workflow

.github/workflows/main.yml

@@ -62,6 +62,11 @@ jobs:
         python -m pip install --upgrade pip
         pip install pandas scikit-learn tensorflow matplotlib mlflow
 
+    - name: Download Artifact
+      uses: actions/download-artifact@v2
+      with:
+        name: model
+
     - name: Evaluate Model
       run: python ./github_project/evaluate.py ${{ github.run_number }}