Dockerize Pet Rescue (#824)

* Initial attempt at running in Docker. It works, but I think assets might be handled differently.

* Add chromium to image and precompile assets - I know this can slow things down, but it should solve the asset delivery issue I was having

* Use PG14

* Add ENV vars and healthcheck for db. Add SASS service.

* Update app name; add db port;

* Use service name postgres instead of db

* add docker instructions to readme

README.md

@@ -9,9 +9,25 @@ The Pet Rescue app is derived from the [Baja Pet Rescue Dog Adoption Application
 
 # 🚀 Getting Started
 
-Let's get your machine setup to startup the application!
+Let's get your machine setup to start up the application!
 
-## Prerequisites
+## Docker
+
+Install a containerization app, such as Docker Desktop.
+
+Clone the repo to your local machine and navigate to the directory and run:
+
+`docker-compose build` to build the base image.
+
+`docker-compose up`  to start the containers. You can add the `-d` flag to run silently without logging.
+
+`docker-compose run --rm app bin/setup` to set up and seed the database.
+
+If you need to run migrations at all: `docker-compose run --rm app bin/rails db:migrate`
+
+Visit `localhost:3000` in your browser.
+
+## Local Installation
 
 ⚠️  We assume you already have ruby installed with your preferred version manager. This codebase supports [rbenv](
 https://github.com/rbenv/rbenv) and [asdf](https://github.com/asdf-vm/asdf-ruby).

docker-compose.yml

@@ -1,20 +1,41 @@
----
+version: '3.8'
 services:
   postgres:
     image: postgres:14
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
     environment:
-      POSTGRES_USER: ${DATABASE_USERNAME}
-      POSTGRES_PASSWORD: ${DATABASE_PASSWORD}
-      POSTGRES_DB: pet_rescue_development
-
+      POSTGRES_DB: petrescue_development
+      POSTGRES_USER: ${DATABASE_USERNAME:-postgres}
+      POSTGRES_PASSWORD: ${DATABASE_PASSWORD:-password}
     ports:
       - 5432
-
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready", "-U", "bwoa", "-d", "pet_rescue_development"]
+      test: ["CMD-SHELL", "pg_isready -U ${DATABASE_USERNAME:-postgres} -d petrescue_development"]
       interval: 10s
+
+  app:
+    build: .
+    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -b '0.0.0.0'"
+    volumes:
+      - .:/petrescue
+    ports:
+      - "3000:3000"
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      DATABASE_URL: postgres://${DATABASE_USERNAME:-postgres}:${DATABASE_PASSWORD:-password}@postgres:5432/petrescue_development
+      RAILS_ENV: development
+
+  sass:
+    build: .
+    command: bundle exec rails dartsass:watch
     volumes:
-      - db:/var/lib/postgresql/data
+      - .:/petrescue
+    depends_on:
+      app:
+        condition: service_started
 
 volumes:
-  db:
+  postgres-data:

dockerfile

@@ -0,0 +1,37 @@
+# Use the official Ruby image as a base
+FROM ruby:3.3.0-slim
+
+# Install dependencies
+RUN apt-get update -qq && apt-get install -y \
+  nodejs \
+  postgresql-client \
+  build-essential \
+  libpq-dev \
+  chromium-driver
+
+# Set up working directory
+WORKDIR /petrescue
+
+# Copy Gemfile and Gemfile.lock before other files to leverage Docker's caching mechanism
+COPY Gemfile /petrescue/Gemfile
+COPY Gemfile.lock /petrescue/Gemfile.lock
+
+# Install gems
+RUN gem install bundler && bundle install
+
+# Copy the rest of the application code
+COPY . /petrescue
+
+# Precompile assets (optional for development, but useful for production)
+RUN bundle exec rails assets:precompile
+
+# Add a script to be executed every time the container starts.
+COPY entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/entrypoint.sh
+
+# Expose port 3000 to the Docker host
+EXPOSE 3000
+
+# Start the Rails server
+ENTRYPOINT ["entrypoint.sh"]
+CMD ["rails", "server", "-b", "0.0.0.0"]

entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+set -e
+
+# Remove a potentially pre-existing server.pid for Rails.
+rm -f /petrescue/tmp/pids/server.pid
+
+# Then exec the container's main process (what's set as CMD in the Dockerfile).
+exec "$@"