update CircleCI config, therubyracer -> mini_racer, bump Rails version

.circleci/config.yml

@@ -2,31 +2,12 @@ version: 2
 jobs:
   build:
     docker:
-      - image: debian:stretch
+      - image: cimg/ruby:3.2.2
+      # use CircleCI convenience image with pre-installed docker/docker-compose
 
     steps:
       - checkout
 
-      # This should go into custom primary image, here's only for the sake of explanation
-      - run:
-          name: Install Docker client
-          command: |
-            set -x
-            VER="17.03.0-ce"
-            apt-get update && apt-get install curl -y
-            curl -L -o /tmp/docker-$VER.tgz https://get.docker.com/builds/Linux/x86_64/docker-$VER.tgz
-            tar -xz -C /tmp -f /tmp/docker-$VER.tgz
-            mv /tmp/docker/* /usr/bin
-
-
-      # This should go into custom primary image, here's only for the sake of explanation
-      - run:
-          name: Install Docker Compose
-          command: |
-            set -x
-            curl -L https://github.com/docker/compose/releases/download/1.11.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
-            chmod +x /usr/local/bin/docker-compose
-
       - setup_remote_docker
 
       - run:

Gemfile

@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '2.6.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 5.2.2'
+gem 'rails', '~> 5.2.5'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.3.6'
 # Use Puma as the app server
@@ -14,7 +14,7 @@ gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'
 # See https://github.com/rails/execjs#readme for more supported runtimes
-# gem 'mini_racer', platforms: :ruby
+gem 'mini_racer', platforms: :ruby
 
 # Use CoffeeScript for .coffee assets and views
 gem 'coffee-rails', '~> 4.2'
@@ -37,7 +37,7 @@ gem 'jbuilder', '~> 2.5'
 gem 'bootsnap', '>= 1.1.0', require: false
 
 gem 'execjs'
-gem 'therubyracer'
+# gem 'therubyracer'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

docker-compose.yaml

@@ -14,6 +14,7 @@ services:
       WALLARM_API_HOST: us1.api.wallarm.com
     ports:
       - '3000:3000'
+    platform: linux/x86_64
     networks:
       main:
         aliases: