Adding docker-compose and alpine based Dockerfile

.dockerignore

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+log
+tmp
+.bundle
+doc
+.git
+.gitignore
+README.md
+DOCKER_README.md
+ROADMAP.md
+CHANGELOG.md
+.dockerignore

Dockerfile.alpine

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+FROM ruby:2.6.3-alpine
+
+RUN apk add --update --no-cache \
+  build-base \
+  mariadb-dev \
+  tzdata \
+  nodejs \
+  libc6-compat
+
+RUN adduser -D staytus
+WORKDIR /staytus
+COPY Gemfile* ./
+COPY config/database.example.yml config/database.yml
+RUN bundle install --binstubs --without development test
+COPY --chown=staytus . .
+
+ARG DATABASE_URL
+ENV RAILS_LOG_TO_STDOUT=TRUE
+RUN bundle exec rake staytus:build
+RUN chown -R staytus:staytus /staytus
+USER staytus
+
+EXPOSE 5000
+
+ENTRYPOINT ["./docker-up.sh"]

docker-compose.yml

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+version: '2'
+
+services:
+  db:
+    image: mariadb:10.4
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD: admin
+      MYSQL_DATABASE: staytus
+      MYSQL_USER: staytus
+      MYSQL_PASSWORD: staytus
+    volumes:
+     - db_data:/var/lib/mysql
+
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile.alpine
+    depends_on:
+     - db
+    ports:
+      - 5000:5000
+    volumes:
+      - .:/staytus
+    environment:
+      DATABASE_URL: "mysql2://staytus:staytus@db/staytus"
+      RAILS_ENV: production
+      LOG_LEVEL: DEBUG
+
+volumes:
+  db_data: {}

docker-up.sh

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+#!/bin/sh
+
+bundle exec rake staytus:install staytus:upgrade
+bundle exec foreman start