Build docker image:
docker build -t my-certbot-image .

Run docker image:
docker run --name my-certbot -d -t -v ~/docker-volumes/letsencrypt:/etc/letsencrypt my-certbot-image

Connect to bash in image
docker exec -it my-certbot /bin/bash

Run certbot:
certbot certonly --manual --preferred-challenges dns -d app.abc.com -m info@abc.com --agree-tos --test-cert

Kill and delete docker container:
exit
docker kill my-certbot
docker rm my-certbot


TODO
=====
- Remove --test-cert
- Map volumes to get generated certificates out of docker container