Auto update SSL certificate

[kavitharaju]

Now the SSL certificates for staging and production deployments are obtained using LetsEncrypt. These expire in 3 months. Now we manually run renewal operation in the certbot container. Need to automate it.
Reference: https://mindsers.blog/post/https-using-nginx-certbot-docker/

[udkumar]

@kavitharaju

I've submitted a Pull Request. Please take a moment to review it. If everything looks good, I'd appreciate if you could approve and merge it.