Docker for development setup (first version)

Dockerfile.development

@@ -0,0 +1,54 @@
+# syntax = docker/dockerfile:1
+
+# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
+ARG RUBY_VERSION=3.2.2
+FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
+
+# Rails app lives here
+WORKDIR /rails
+
+ENV RAILS_ENV="development" \
+    BUNDLE_PATH="/gems" \
+    LANG=C.UTF-8 \
+    BUNDLE_JOBS=10 \
+    BUNDLE_RETRY=3
+
+# Throw-away build stage to reduce size of final image
+FROM base as build
+
+# Install packages needed to build gems and node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential curl git libpq-dev node-gyp pkg-config python-is-python3
+
+# Install JavaScript dependencies
+ARG NODE_VERSION=18.16.0
+ARG YARN_VERSION=1.22.19
+ENV PATH=/usr/local/node/bin:$PATH
+RUN curl -sL https://github.com/nodenv/node-build/archive/master.tar.gz | tar xz -C /tmp/ && \
+    /tmp/node-build-master/bin/node-build "${NODE_VERSION}" /usr/local/node && \
+    npm install -g yarn@$YARN_VERSION && \
+    rm -rf /tmp/node-build-master
+
+# Install application gems
+COPY Gemfile Gemfile.lock ./
+RUN bundle install && \
+    rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
+
+# Install node modules
+COPY package.json yarn.lock ./
+RUN yarn install --frozen-lockfile
+
+# Copy application code
+COPY . .
+
+# Run and own only the runtime files as a non-root user for security
+RUN useradd rails --create-home --shell /bin/bash && \
+    chown -R rails:rails db log tmp
+USER rails:rails
+
+# Entrypoint prepares the database.
+ENTRYPOINT ["/rails/bin/docker-entrypoint"]
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD ["./bin/rails", "server"]

config/database.yml

@@ -23,7 +23,8 @@ default: &default
 
 development:
   <<: *default
-  database: podapp_development
+  url: <%= ENV['DATABASE_URL'] || "postgres://localhost:5432" %>
+  database: boilerplate_development
 
   # The specified database role being used to connect to postgres.
   # To create additional roles in postgres see `$ createuser --help`.
@@ -57,7 +58,8 @@ development:
 # Do not set this db to the same as development or production.
 test:
   <<: *default
-  database: podapp_test
+  url: <%= ENV['DATABASE_URL'] || ENV['DATABASE_URL_LOCAL'] %>
+  database: boilerplate_test
 
 # As with config/credentials.yml, you never want to store sensitive information,
 # like your database password, in your source code. If your source code is

docker-compose.yml

@@ -0,0 +1,45 @@
+version: '3.7'
+
+x-backend: &backend
+  stdin_open: true
+  tty: true
+  build:
+    context: .
+    dockerfile: ./Dockerfile.development
+  volumes:
+    - .:/rails
+    - node_modules:/rails/node_modules
+    - gem_cache:/gems
+  depends_on:
+    - database
+  entrypoint: ./bin/docker-entrypoint
+
+services:
+  rails:
+    <<: *backend
+    ports:
+      - '3000:3000'
+    environment:
+      - RUBY_DEBUG_OPEN=true
+      - DATABASE_URL=postgres://postgres:postgres@database:5432
+    command: ./bin/rails server -b 0.0.0.0
+
+  js:
+    <<: *backend
+    command: yarn build --watch
+
+  css:
+    <<: *backend
+    command: yarn build:css --watch
+
+  database:
+    image: 'postgres:15'
+    volumes:
+      - postgres:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: postgres
+
+volumes:
+  postgres:
+  gem_cache:
+  node_modules: