Use rspec binstub in CI

.drone.yml

@@ -21,10 +21,12 @@ steps:
     environment:
       RAILS_ENV: test
     commands:
-      - bundle install --jobs=3 --retry=3 --deployment --with development test
+      - bundle config set deployment 'true'
+      - bundle config set with 'development test'
+      - bundle install --jobs=3 --retry=3
       - yarn install
       - yarn run build:css
-      - bundle exec rspec
+      - bin/rspec
     when:
       branch:
         - master

Gemfile

@@ -47,6 +47,7 @@ gem 'sidekiq-scheduler'
 group :development, :test do
   # Use sqlite3 as the database for Active Record
   gem 'sqlite3', '~> 1.4'
+  gem 'rspec-rails'
 end
 
 group :development do
@@ -58,7 +59,6 @@ group :development do
 end
 
 group :test do
-  gem 'rspec-rails'
   gem 'factory_bot_rails'
   gem 'capybara'
   gem 'database_cleaner'

bin/rspec

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rspec' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require "pathname"
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+  Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rspec-core", "rspec")