Add new challenge

challenges/flask_container_ci/README.md

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+Your mission, should you choose to accept it, involves fixing the app in this directory, containerize it and set up a CI for it.
+Please read carefully all the instructions.
+
+## Installation
+
+1. Create a virtual environment with `python3 -m venv challenge_venv`
+2. Activate it with `source challenge_venv/bin/activate`
+3. Install requirements.txt `pip install -r requirements.txt`
+
+## Run the app
+
+1. Run `export FLASK_APP=app/app.py`
+1. To run the app execute `flask run`. If it doesn't works, fix it
+
+
+## Containers
+
+Using Docker or Podman, containerize the flask app so users can run the following two commands:
+
+```
+docker build -t app:latest /path/to/Dockerfile
+docker run -d -p 5000:5000 app
+```
+
+1. You can use any image base you would like
+2. Containrize only what you need for running the application, nothing else.
+
+## CI
+
+Great, now that we have a working app and also can run it in a container, let's set up a CI for it so it won't break again in the future
+
+1. The CI should run the tests in the app directory
+2. There should be some kind of test for the Dockerfile you wrote
+2. Add additional unit test (or another level of tests)

challenges/flask_container_ci/app/app.py

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+#!/usr/bin/env python
+# coding=utf-8
+
+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return 'Hello, World!'

challenges/flask_container_ci/app/config.py

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+#!/usr/bin/env python
+# coding=utf-8
+
+import os
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+SECRET_KEY = 'shhh'
+CSRF_ENABLED = True
+
+SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'app.db')
+

challenges/flask_container_ci/app/tests.py

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+#!/usr/bin/env python
+# coding=utf-8
+
+import os
+import unittest
+
+from config import basedir
+from app import app 
+from app import db
+
+class TestCase(unittest.TestCase):
+
+    def setUp(self):
+        app.config['TESTING'] = True
+        app.config['WTF_CSRF_ENABLED'] = False
+        app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'test.db')
+        self.app = app.test_client()
+        db.create_all()
+
+    def tearDown(self):
+        db.session.remove()
+        db.drop_all()
+
+if __name__ == '__main__':
+    unittest.main()