Add docker config files

Dockerfile

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+# vim:set ft=dockerfile:
+
+FROM ruby:2.7-alpine as app
+
+LABEL maintainer="Peter Hamilton <[email protected]>" \
+      description="ROM-LDAP with Rails"
+
+RUN apk add --no-cache --no-progress \
+      build-base \
+      openldap-clients \
+      sqlite-dev \
+      tzdata
+
+WORKDIR /usr/app
+
+VOLUME /usr/app
+
+EXPOSE 3000
+
+COPY docker-entrypoint.sh /
+
+RUN chmod +x /docker-entrypoint.sh
+
+ENTRYPOINT ["/docker-entrypoint.sh"]

docker-compose.yml

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+---
+version: '2.4'
+
+
+# https://docs.docker.com/compose/networking/#use-a-pre-existing-network
+# $ docker network ls
+networks:
+  default:
+    external:
+      name: docker_rom-ldap-network
+
+
+services:
+  rom-ldap-rails:
+    container_name: rom_ldap_rails
+    build:
+      context: .
+    volumes:
+      - .:/usr/app
+      - ./tmp/bundler:/usr/local/bundle
+    ports:
+      - 3002:3000
+    environment:
+      - TZ
+      - LOCALE
+      - LDAPURI=ldap://cn=admin,dc=rom,dc=ldap:topsecret@openldap
+      - RAILS_ENV=development
+    command: rails server
+    tty: true
+    stdin_open: true
+    networks:
+      - default

docker-entrypoint.sh

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+#!/bin/sh
+
+set -e
+
+echo "Ruby version:"
+ruby --version
+
+echo "Installing ruby gems:"
+gem install bundler --no-document
+bundle check || bundle install
+
+echo "Create and migrate database:"
+bundle exec rake db:migrate
+
+exec bundle exec "$@"