update tests

core/__snapshots__/TestGenerateBuildPlanForExamples_python-poetry_1.snap.json

@@ -96,6 +96,9 @@
     {
      "path": "/root/.local/bin"
     },
+    {
+     "path": "/app/.venv/bin"
+    },
     {
      "cmd": "poetry config virtualenvs.in-project true"
     },

examples/python-poetry/main.py

@@ -1,5 +1,9 @@
+import os
 from flask import Flask
 
+path = os.environ['PATH']
+assert path.startswith("/app/.venv/bin"), f"Expected PATH to start with /app/.venv/bin but got {path}"
+
 app = Flask(__name__)
 
 @app.route("/")