Add dev dockerfiles

Dockerfile.dev

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+FROM ruby:2.2.10
+
+ENV RAILS_ENV development
+
+# Add 'web' user which will run the application
+RUN adduser web --home /home/web --shell /bin/bash --disabled-password --gecos ""
+
+RUN apt-get update && apt-get -y upgrade \
+    && apt-get -y install mysql-client libmysqlclient-dev memcached nodejs firefox-esr \
+    && service memcached start
+
+# Separate Gemfile ADD so that `bundle install` can be cached more effectively
+
+ADD Gemfile Gemfile.lock /var/www/
+
+RUN mkdir -p /var/bundle && chown -R web:web /var/bundle && chown -R web:web /var/www
+RUN su -c "bundle config github.https true; cd /var/www && bundle install --path /var/bundle --jobs 4" -s /bin/bash -l web
+
+WORKDIR /var/www
+USER web
+
+RUN bundle config github.https true; cd /var/www && bundle install --path /var/bundle --jobs 4
+
+USER root
+CMD ["/var/www/script/entry.sh"]

docker-compose.dev.yml

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+version: "3"
+
+services:
+  web:
+    build:
+      context: ./
+      dockerfile: Dockerfile.dev
+      args:
+        buildno: 1
+    volumes:
+     - ".:/var/www/"
+    ports:
+     - "4000:4000"
+    links:
+     - db
+     - memcached
+  #    - redis
+  db:
+    # Debug
+    #    command: bash 
+    #tty: true
+    command: mysqld_safe --skip-grant-tables
+    image: mariadb:latest
+    volumes:
+     - "./db_data:/var/lib/mysql"
+     - "./ext/mysql.conf.d:/etc/mysql/conf.d"
+    environment:
+     - MYSQL_DATABASE=ensl
+     - MYSQL_USER=ensl
+     - MYSQL_USERNAME=ensl
+     - MYSQL_PASSWORD=ensl
+     - MYSQL_ROOT_PASSWORD=ensl
+     - MYSQL_ROOT_HOST=%
+  memcached:
+    image: memcached:latest
+  #redis:
+  #  image: redis