Dockerize the demo_web_app

[refs #28500babc311]

Dockerfile

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+FROM ruby:2.4.3
+
+RUN apt-get update && apt-get install -y postgresql-client
+
+WORKDIR /tmp
+COPY Gemfile* ./
+RUN bundle install
+
+WORKDIR /app
+COPY . .
+
+ARG WAIT_FOR_POSTGRES=false
+ARG PREPARE_DATABASE=false
+
+ENV WAIT_FOR_POSTGRES=$WAIT_FOR_POSTGRES PREPARE_DATABASE=$PREPARE_DATABASE
+ENV POSTGRES_HOST=localhost POSTGRES_USER=web_app POSTGRES_PASSWORD=
+
+EXPOSE 9292
+
+ENTRYPOINT ["/app/bin/docker-entrypoint.sh"]
+CMD ["bundle", "exec", "rackup", "-o", "0.0.0.0"]

bin/docker-entrypoint.sh

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+#!/usr/bin/env bash
+if [ "$WAIT_FOR_POSTGRES" == "true" ]; then
+  echo Waiting for postgres to start...
+  while ! pg_isready -h $POSTGRES_HOST > /dev/null; do
+    sleep 0.5; done
+  echo ..done
+fi
+if [ "$PREPARE_DATABASE" == "true" ]; then
+  bundle exec rake db:create db:migrate
+fi
+exec "$@"

docker-compose.override.yml

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+version: '3.3'
+
+services:
+  app:
+    build:
+      context: .
+    volumes:
+      - ./:/app
+    ports:
+      - 9292:9292

docker-compose.yml

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+version: '3.3'
+
+services:
+  app:
+    image: jfahrer/demo_web_app:latest
+    environment:
+      - POSTGRES_HOST=pg
+      - POSTGRES_USER=web_app
+      - POSTGRES_PASSWORD=secret
+
+  pg:
+    image: postgres:9.6.6-alpine
+    environment:
+      - POSTGRES_USER=web_app
+      - POSTGRES_PASSWORD=secret

scripts/setup-env.sh

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+#!/bin/bash
+docker-compose down
+
+docker-compose up -d pg
+
+echo "Setting up the development database"
+docker-compose run --rm -e WAIT_FOR_POSTGRES=true app bundle exec rake db:create db:migrate
+
+echo "Setting up the test database"
+docker-compose run --rm -e RACK_ENV=test app bundle exec rake db:create db:migrate