kill the startup script if python fails to start (#237)

* kill the startup script if python fails to start

* Update scripts/startup_app.sh

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

---------

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

Author: jkwatson

scripts/startup_app.sh

@@ -77,10 +77,15 @@ source scripts/load_nvm.sh > /dev/null
 # start Python backend
 cd llm-service
 mkdir -p $MLFLOW_RECONCILER_DATA_PATH
-uv run fastapi run --reload --host 127.0.0.1 --port 8081 2>&1 &
 
+uv run fastapi run --host 127.0.0.1 --port 8081 2>&1 &
+PY_BACKGROUND_PID=$!
 # wait for the python backend to be ready
 while ! curl --output /dev/null --silent --fail http://localhost:8081/amp; do
+    if ! kill -0 "$PY_BACKGROUND_PID" 2>/dev/null; then
+        echo "Python backend process exited unexpectedly."
+        exit 1
+    fi
     echo "Waiting for the Python backend to be ready..."
     sleep 4
 done