$ docker build -t annict/ruby .
$ docker container run -i -t <Image ID> /bin/ash
$ docker build -t annict/ruby .
$ docker tag annict/ruby annict/ruby:2.7.2-node_12.16.1
$ docker push annict/ruby:2.7.2-node_12.16.1
A Dockerfile for running spec on CircleCI
$ docker build -t annict/ruby .
$ docker container run -i -t <Image ID> /bin/ash
$ docker build -t annict/ruby .
$ docker tag annict/ruby annict/ruby:2.7.2-node_12.16.1
$ docker push annict/ruby:2.7.2-node_12.16.1