[WIP] docker setup and ruby 2.5.1.

.ruby-version

@@ -1 +1 @@
-2.4.2
+2.5.1

Dockerfile

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+FROM ruby:2.5.1
+MAINTAINER [email protected]
+
+# Install apt based dependencies required to run Rails as
+# well as RubyGems. As the Ruby image itself is based on a
+# Debian image, we use apt-get to install those.
+RUN apt-get update && apt-get install -y \
+  postgresql-client \
+  build-essential \
+  locales \
+  nodejs
+
+# Use en_US.UTF-8 as our locale
+RUN echo "LC_ALL=en_US.UTF-8" >> /etc/environment
+RUN echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
+RUN echo "LANG=en_US.UTF-8" > /etc/locale.conf
+RUN locale-gen en_US.UTF-8
+RUN dpkg-reconfigure --frontend=noninteractive locales
+
+# Make /app our working directory.
+RUN mkdir -p /app
+WORKDIR /app
+
+# Install bundler and make sure that the gems are cached
+# at /cache/bundle.
+ENV BUNDLE_PATH /cache/bundle
+RUN gem install bundler
+
+# Copy the main application.
+COPY . ./
+
+# Expose port 3000 to the Docker host, so we can access it
+# from the outside.
+EXPOSE 3000
+
+# Configure an entry point, so we don't need to specify
+# "bundle exec" for each of our commands.
+ENTRYPOINT ["./bin/docker/run"]

bin/docker/run

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+#!/bin/bash
+
+if bundle check &> /dev/null; then
+  bundle exec "$@"
+else
+  exec "$@"
+fi

bin/docker/start

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+#!/bin/bash
+
+bundle check || bundle install --jobs 5
+
+yarn check || yarn install
+
+bundle exec rails server -b 0.0.0.0

docker-compose.yml

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+version: "2"
+services:
+  postgres:
+    image: postgres:10-alpine
+    volumes:
+      - .:/app
+    ports:
+      - "5432:5432"
+  app:
+    build: .
+    command: ./bin/docker/start
+    volumes:
+      - .:/app
+    volumes_from:
+      - cache
+    environment:
+      - WITHIN_DOCKER=1
+      - PGHOST=postgres
+      - PGUSER=postgres
+    ports:
+      - "3000:3000"
+    depends_on:
+      - postgres
+  cache:
+    image: busybox
+    volumes:
+      - /cache