Remove unnecessary executable bit form docker-entrypoint.tt

The docker-entrypoint.tt template doesn't require the executable
permission bit as it isn't executed on its own. It's rendered file
"bin/docker-entrypoint" does require the executable bit which continues
to be set in AppBuilder#dockerfiles.

Author: jdufresne

railties/lib/rails/generators/rails/app/templates/docker-entrypoint.tt

@@ -30,6 +30,9 @@ def test_skeleton_is_created
 
     default_files.each { |path| assert_file path }
     skipped_files.each { |path| assert_no_file path }
+
+    absolute = File.expand_path("bin/docker-entrypoint", destination_root)
+    assert File.executable?(absolute)
   end
 
   def test_api_modified_files

railties/test/generators/api_app_generator_test.rb

@@ -79,6 +79,10 @@ def test_codebase_is_created
 
     default_files.each { |path| assert_file path }
 
+    if default_files.include?("bin/docker-entrypoint")
+      assert File.executable?("#{application_path}/bin/docker-entrypoint")
+    end
+
     assert_file "#{application_path}/config/application.rb", /\s+require\s+["']rails\/all["']/
 
     assert_file "#{application_path}/config/environments/development.rb" do |content|