Snap Certbot + DNS Azure + Containers POC

Success: HTTPS traffic is reaching the homepage container through the Nginx reverse proxy container.

• Domain: snapcertbot.dt.gw.renalytixai.com
• Certbot: Snap on VM OS
• Validation: Azure DNS TXT challenge (DNS-01)
• Nginx: Docker container
• Homepage: Separate Docker container
• Certificates: Mounted read-only from /etc/letsencrypt
• Inbound ports required: 443 only