Change to foreman to run app, so we can run workers too

Dockerfile

@@ -1,6 +1,7 @@
 FROM ruby:3.0-alpine AS build
 
 RUN apk add --no-cache tzdata alpine-sdk postgresql-dev nodejs yarn python2
+RUN gem install foreman
 
 ENV PORT 3214
 ENV RACK_ENV production
@@ -28,4 +29,4 @@ RUN \
 
 EXPOSE 3214
 ENTRYPOINT ["bin/docker-entrypoint.sh"]
-CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]
+CMD ["foreman", "start"]

Procfile

@@ -0,0 +1 @@
+rails: bundle exec rails server -p $PORT

README.md

@@ -24,17 +24,18 @@ You can run all the dependencies in one go using `docker-compose`:
 * Bundler 2.x
 * Node.js 14.x
 * Yarn >= 1.22
+* Foreman or [another Procfile runner](https://github.com/ddollar/foreman#ports)
 
 ### Usage
 
 ```
 bundle install
 yarn install
 bundle exec rake db:migrate
-bundle exec rails server
+foreman start
 ```
 
-The server will then be running at http://127.0.0.1:3000
+The server will then be running at http://127.0.0.1:5000
 ### How to run the test suite
 
 `bundle exec rake`