Here is a Rails-Docker starter kit, that would allow you to get your app up and running in 3 steps.

What's in the box?

• Rails 6
• Docker
• Postgres
• Traefik basic setup to run https locally

Make sure you have the following installed

• Docker - check out https://docs.docker.com/get-docker/ for details
• docker-compose cli - check out https://docs.docker.com/compose/install/ for installation details

As of now I am running docker desktop v3.0.4 on my mac and docker-compose cli v1.27.4

Here is a starter kit for Rails 6. Setup is simply 2 steps.

1. Install and run starter kit by running ...

   git clone https://github.com/joshtune/rails-docker-starter-kit.git
   cd rails-docker-starter-kit && chmod +x init.sh && ./init.sh

2. Open app in your browser at https://rdskit.localhost/

After installation, you now have a fresh rails app, ready for development.

You should have full access to rails cli. Check it out ...

# input
docker-compose run --rm app rails -v

# output
Creating rails-docker-starter-kit_app_run ... done
Rails 6.1.1

input

# input
docker-compose run --rm app rails -v

# output
Creating rails-docker-starter-kit_app_run ... done
The most common rails commands are:
 generate     Generate new code (short-cut alias: "g")
 console      Start the Rails console (short-cut alias: "c")
 server       Start the Rails server (short-cut alias: "s")
 test         Run tests except system tests (short-cut alias: "t")
 test:system  Run system tests
 dbconsole    Start a console for the database specified in config/database.yml
              (short-cut alias: "db")

 new          Create a new Rails application. "rails new my_app" creates a
              new application called MyApp in "./my_app"           
 ...