Add week 6 materials

materials/06-failures/seminar/consul-demo/app/Dockerfile

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+FROM python:3.9-slim-buster
+
+WORKDIR /app
+
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+
+COPY . .
+
+CMD ["python", "./main.py"]

materials/06-failures/seminar/consul-demo/app/main.py

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+import os
+from flask import Flask
+from consul import Consul, Check
+
+app = Flask(__name__)
+
+consul_host = os.environ.get('CONSUL_HOST', 'localhost')
+consul_port = os.environ.get('CONSUL_PORT', 8500)
+my_host = os.environ.get('MY_HOST', 'localhost')
+my_port = os.environ.get('MY_PORT', 5000)
+
+# Initialize Consul client
+consul = Consul(host=consul_host, port=consul_port)
+
+# Register the Flask app in Consul
+service_name = 'flask-hello-world'
+consul.agent.service.register(
+    name=service_name,
+    service_id=f'{service_name}-{my_host}',
+    port=my_port,
+    check=Check.http(f'http://{my_host}:{my_port}/health', interval='10s', deregister='30s')
+)
+
+@app.route('/')
+def hello():
+    return 'Hello, World!'
+
+@app.route('/health')
+def health():
+    return 'OK'
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=my_port)

materials/06-failures/seminar/consul-demo/app/requirements.txt

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+python-consul==1.1.0
+Flask==2.2.2
+Werkzeug==2.2.2