GitOps the Hard Way, with Argo CD

# Install pip and virtualenv
apt install python3-pip -y
pip install virtualenv --break-system-packages

mkdir -p $HOME/todo/app

cd $HOME/todo/app

# Create a new virtual environment
virtualenv venv

# Activate the virtual environment
source venv/bin/activate

curl -fsSL https://raw.githubusercontent.com/github/gitignore/main/Python.gitignore \
-o $HOME/todo/app/.gitignore

# Install Flask
pip install Flask==3.0.0

# Create the requirements.txt file
pip freeze > $HOME/todo/app/requirements.txt

cat << EOF> $HOME/todo/app/app.py
# Import the required libraries from Flask.
from flask import Flask, jsonify, request


# Create a Flask application instance.
# This instance will be the central object of the app.
app = Flask(__name__)


# Define a list to store tasks.
# Each task will be a dictionary containing details
# such as id, title, and description.
tasks = []


# Define a route to handle GET requests to retrieve all tasks.
# When a user sends a GET request to the '/tasks' endpoint,
# this function will be triggered.
@app.route('/tasks', methods=['GET'])
def get_tasks():
    # Return a JSON response containing the list of all tasks.
    # The jsonify function converts the list into a JSON format.
    return jsonify(
        {
            # Wrap the tasks list in a dictionary with the key 'tasks'.
            'tasks': tasks
        }
    )


# Define a route to handle POST requests to add a new task.
# When a user sends a POST request to the '/tasks' endpoint,
# this function will be triggered.
@app.route('/tasks', methods=['POST'])
def add_task():
    # Create a new task as a dictionary.
    # The task ID is generated by incrementing
    # the length of the current tasks list.
    task = {
        'id': len(tasks) + 1,
        # Get the 'title' of the task from the incoming JSON.
        'title': request.json['title'],
        # Get the 'description' of the task from the incoming JSON.
        'description': request.json['description']
    }

    # Append the newly created task to the tasks list.
    tasks.append(task)

    # Return the newly created task as a JSON response
    # with a 201 HTTP status code.
    # The status code 201 indicates that the resource
    # was successfully created.
    return jsonify(task), 201


# Launch the Flask application.
# This will start a local web server that listens
# on port 5000 on all interfaces ('0.0.0.0').
# The 'debug=True' argument enables the debug mode,
# which provides detailed error messages
# and auto-reloads the server when changes are detected.
if __name__ == '__main__':
    app.run(
        debug=True,
        host