[DRE-maint] Bug#966838: rails: newapp autopkgtest failed and it also broke autopkgtest for many rails assets packages

[Pirate Praveen]

Package: rails
Version: 6.0.3.2+dfsg-4
Severity: serious

https://ci.debian.net/data/autopkgtest/testing/arm64/r/ruby-rails-assets-autosize/6520761/log.gz 
(same error in rails as well other autopkgtest failures)

         run bundle install --local
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/generators/app_base.rb:364:in 
`block in bundle_command': undefined local variable or method 
`_bundle_command' for 
#<Rails::Generators::AppGenerator:0x0000aaaad68bccd0> (NameError)
Did you mean? bundle_command
               exec_bundle_command
 from /usr/lib/ruby/2.7.0/bundler.rb:364:in `block in with_original_env'
 from /usr/lib/ruby/2.7.0/bundler.rb:677:in `with_env'
 from /usr/lib/ruby/2.7.0/bundler.rb:364:in `with_original_env'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/generators/app_base.rb:363:in 
`bundle_command'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/generators/app_base.rb:406:in 
`run_bundle'
 from (eval):1:in `run_bundle'
 from /usr/lib/ruby/vendor_ruby/thor/command.rb:27:in `run'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:126:in 
`invoke_command'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:133:in `block in 
invoke_all'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:133:in `each'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:133:in `map'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:133:in `invoke_all'
 from /usr/lib/ruby/vendor_ruby/thor/group.rb:232:in `dispatch'
 from /usr/lib/ruby/vendor_ruby/thor/base.rb:466:in `start'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/commands/application/application_command.rb:26:in 
`perform'
 from /usr/lib/ruby/vendor_ruby/thor/command.rb:27:in `run'
 from /usr/lib/ruby/vendor_ruby/thor/invocation.rb:126:in 
`invoke_command'
 from /usr/lib/ruby/vendor_ruby/thor.rb:387:in `dispatch'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/command/base.rb:69:in 
`perform'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/command.rb:46:in 
`invoke'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/lib/rails/cli.rb:18:in 
`<top (required)>'
 from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in 
`require'
 from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:72:in 
`require'
 from 
/usr/share/rubygems-integration/all/gems/railties-6.0.3.2/exe/rails:10:in 
`<top (required)>'
 from /usr/bin/rails:23:in `load'
 from /usr/bin/rails:23:in `<main>'