use here-doc

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: yoomlam

.github/workflows/run-experiment.yml

@@ -26,10 +26,10 @@ jobs:
       working-directory: ./app
       run: |
         # Create override.env file used by Docker image
-        echo "
-        DEPLOYED_PHOENIX_URL=${{ secrets.DEPLOYED_PHOENIX_URL }}
-        DEPLOYED_PHOENIX_API_KEY=${{ secrets.DEPLOYED_PHOENIX_API_KEY }}
-        DEPLOYED_API_URL=${{ secrets.DEPLOYED_API_URL }}
-        " > override.env
+        cat > override.env <<EOF
+DEPLOYED_PHOENIX_URL=${{ secrets.DEPLOYED_PHOENIX_URL }}
+DEPLOYED_PHOENIX_API_KEY=${{ secrets.DEPLOYED_PHOENIX_API_KEY }}
+DEPLOYED_API_URL=${{ secrets.DEPLOYED_API_URL }}
+EOF
 
         make run-experiment DATASET="${{ github.event.inputs.dataset_name }}" PIPELINE="${{ github.event.inputs.pipeline_name }}" ACTION="run_on_deployed"