Remove setting RAILS_ENV from RACK_ENV

Per #3200

Author: justin808

lib/install/bin/webpack

@@ -5,7 +5,7 @@ require "bundler/setup"
 require "webpacker"
 require "webpacker/webpack_runner"
 
-ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["RAILS_ENV"] ||= "development"
 ENV["NODE_ENV"]  ||= "development"
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile", Pathname.new(__FILE__).realpath)
 

lib/install/bin/webpack-dev-server

@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 
-ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["RAILS_ENV"] ||= "development"
 ENV["NODE_ENV"]  ||= "development"
 
 require "pathname"

test/mounted_app/test/dummy/bin/yarn

@@ -0,0 +1,18 @@
+#!/usr/bin/env ruby
+
+APP_ROOT = File.expand_path("..", __dir__)
+Dir.chdir(APP_ROOT) do
+  yarn = ENV["PATH"].split(File::PATH_SEPARATOR).
+    select { |dir| File.expand_path(dir) != __dir__ }.
+    product(["yarn", "yarnpkg", "yarn.cmd", "yarn.ps1"]).
+    map { |dir, file| File.expand_path(file, dir) }.
+    find { |file| File.executable?(file) }
+
+  if yarn
+    exec yarn, *ARGV
+  else
+    $stderr.puts "Yarn executable was not detected in the system."
+    $stderr.puts "Download Yarn at https://yarnpkg.com/en/docs/install"
+    exit 1
+  end
+end

test/test_app/bin/webpack

@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 
-ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["RAILS_ENV"] ||= "development"
 ENV["NODE_ENV"] ||= ENV["RAILS_ENV"]
 
 require "pathname"

test/test_app/bin/webpack-dev-server

@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 
-ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
+ENV["RAILS_ENV"] ||= "development"
 ENV["NODE_ENV"] ||= ENV["RAILS_ENV"]
 
 require "pathname"