build: 🔨 Docker setup

Dockerfile, docker-compose and entrypoint

.dockerignore

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+.vscode
+README.md

.env.dev

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+RAILS_ENV=development
+HOST=0.0.0.0
+PORT=3000
+
+DATABASE_NAME=url_shortener
+DATABASE_USER=user
+DATABASE_PASSWORD=user_12345

.gitignore

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+# See https://help.github.com/articles/ignoring-files for more about ignoring files.
+#
+# If you find yourself ignoring temporary files generated by your text editor
+# or operating system, you probably want to add a global ignore instead:
+#   git config --global core.excludesfile '~/.gitignore_global'
+
+# Ignore bundler config.
+/.bundle
+
+# Ignore all logfiles and tempfiles.
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+# Ignore uploaded files in development
+/storage/*
+!/storage/.keep
+
+/node_modules
+/yarn-error.log
+
+/public/assets
+.byebug_history

Dockerfile.dev

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+
+FROM ruby:2.6.6-alpine
+
+ENV APP_PATH /usr/src/app
+ENV BUNDLE_VERSION 2.1.4
+ENV BUNDLE_PATH /usr/local/bundle/gems
+ENV RAILS_LOG_TO_STDOUT true
+ENV RAILS_PORT 3000
+
+WORKDIR $APP_PATH
+
+EXPOSE $RAILS_PORT
+
+RUN apk -U add --no-cache \
+build-base \
+postgresql-dev \
+postgresql-client \
+tzdata \
+yarn
+
+COPY ./entrypoint.dev.sh /usr/bin/entrypoint.sh
+RUN chmod +x /usr/bin/entrypoint.sh
+
+RUN gem install bundler --version "$BUNDLE_VERSION"
+RUN gem install rubocop
+
+COPY . .
+
+ENTRYPOINT ["entrypoint.sh"]

docker-compose.yml

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+version: '3'
+
+services:
+  db:
+    image: postgres:12.5-alpine
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: user_12345
+      POSTGRES_DB: url_shortener
+    ports:
+      - 5432:5432
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    volumes:
+      - .:/usr/src/app
+      - gem_cache:/usr/local/bundle/gems
+    command: bundle exec rails s -p 3000 -b '0.0.0.0'
+    stdin_open: true
+    tty: true
+    env_file: .env.dev
+    ports:
+      - 3000:3000
+    depends_on:
+      - db
+volumes:
+  gem_cache:
+  db_data:

entrypoint.dev.sh

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+#!/bin/sh
+
+set -e
+echo "Environment: $RAILS_ENV"
+
+bundle check || bundle install --jobs 20 --retry 5
+
+rm -f $APP_PATH/tmp/pids/server.pid
+
+${@}