Update quickstart samples to Nodejs24

Author: srinjoyray

appengine/building-an-app/build/.gcloudignore

@@ -0,0 +1,17 @@
+# This file specifies files that are *not* uploaded to Google Cloud
+# using gcloud. It follows the same syntax as .gitignore, with the addition of
+# "#!include" directives (which insert the entries of the given .gitignore-style
+# file at that point).
+#
+# For more information, run:
+#   $ gcloud topic gcloudignore
+#
+.gcloudignore
+# If you would like to upload your .git directory, .gitignore file or files
+# from your .gitignore file, remove the corresponding line
+# below:
+.git
+.gitignore
+
+# Node.js dependencies:
+node_modules/

appengine/building-an-app/build/app.yaml

@@ -12,5 +12,5 @@
 # limitations under the License.
 
 # [START gae_build_app_yaml_node]
-runtime: nodejs20
+runtime: nodejs24
 # [END gae_build_app_yaml_node]

appengine/building-an-app/build/package.json

@@ -14,7 +14,7 @@
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git"
   },
   "engines": {
-    "node": "20.x.x"
+    "node": "24.x.x"
   },
   "author": "Google Inc.",
   "license": "Apache-2.0",

appengine/hello-world/flexible/app.yaml

@@ -16,7 +16,7 @@
 runtime: nodejs
 env: flex
 runtime_config:
-  operating_system: ubuntu22
+  operating_system: ubuntu24
 # This sample incurs costs to run on the App Engine flexible environment.
 # The settings below are to reduce costs during testing and are not appropriate
 # for production use. For more information, see: