Add Docker Compose file

docker-compose.yml

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+version: '3.7'
+
+services:
+  app:
+    build:
+      context: ./docker/app
+    depends_on:
+      - db
+    env_file:
+      - "./docker/dev.env"
+    volumes:
+      - ./:/clarion
+    environment:
+      - BUNDLE_PATH=./vendor
+    working_dir: "/clarion"
+    command: "./docker/app/run.sh"
+    ports:
+      - 127.0.0.1:3000:3000
+  db:
+    image: postgres:11.9
+    volumes:
+      - clarion-db:/var/lib/postgresql/data
+    env_file:
+      - "./docker/dev.env"
+
+volumes:
+  clarion-db:

docker/app/Dockerfile

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+FROM ruby:2.6.5
+
+RUN apt-get update && apt-get install -y postgresql-client

docker/app/run.sh

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+#!/bin/sh
+
+# Install dependencies
+bundle install
+
+# DB migrations
+./bin/rails db:create
+./bin/rails db:migrate
+./bin/rails db:seed
+
+# Remove leftover PID file from non-clean exit
+rm tmp/pids/server.pid
+./bin/rails server --binding=0.0.0.0

docker/dev.env

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+RAILS_ENV=development
+
+POSTGRES_HOST=db
+POSTGRES_USER=clarion
+POSTGRES_PASSWORD=clarion
+POSTGRES_DB=clarion