Create a Google App Engine application using GCP Cloud Shell environment and Configure Cloud Build to Deploy Changes on build.

1. Create a new project on GCP

2. Create app engine app in cloud shell:

gcloud app create

3. Clone the hello world sample app repo, and cd into the repo:

git clone https://github.com/GoogleCloudPlatform/python-docs-samples
cd python-docs-samples/appengine/standard_python37/hello_world

4. create and source the virtual environment:

virtualenv --python $(which python) venv
source venv/bin/activate

5. install packages:

pip install -r requirement.txt

6. run flask locally:

python main.py

7. update main.py

from flask import Flask
from flask import jsonify

app = Flask(__name__)

@app.route('/')
def hello():
    """Return a friendly HTTP greeting."""
    return 'Hello I like to make AI Apps'

@app.route('/name/<value>')
def name(value):
    val = {"value": value}
    return jsonify(val)

if __name__ == '__main__':
    app.run(host='127.0.0.1', port=8080, debug=True)

8. Deploy the flask app:

gcloud app deploy

it should look like this:
```bash
Setting traffic split for service [default]...done.
Deployed service [default] to [https://helloml-xxx.appspot.com]
You can stream logs from the command line by running:
  $ gcloud app logs tail -s default

  $ gcloud app browse
(venv) noah_gift@cloudshell:~/python-docs-samples/appengine/standard_python37/hello_world (helloml-242121)$ gcloud app
 logs tail -s default
Waiting for new log entries...
```

1. Create a cloud build yaml file:

   steps:
   - name: "gcr.io/cloud-builders/gcloud"
     args: ["app", "deploy"]

2. Follow steps in this tutorial:

   https://cloud.google.com/cloud-build/docs/automating-builds/create-github-app-triggers