Resurrect installer.

Running `./bin/rails generate mailbox application --no-test-framework` generates:

```

class ApplicationMailbox < ApplicationMailbox
  def process
  end
end
```

which is not correct for the application mailbox. It shouldn't
respond to process but it should contain a routing hint.

Generally generators aren't meant to be used like the previous commit.
The mailbox generator can certainly add in the ApplicationMailbox
if missing, but it shouldn't be called with "application" as an argument.

Also adds back auto inserting an `ingress` config line in
`config/environmnets/production.rb`.

Fixes #13.

[Kasper Timm Hansen, Andrew Babichev]

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/rails/generators/installer.rb b/lib/rails/generators/installer.rb
new file mode 100644
index 0000000000..a2bc4b5412
--- /dev/null
+++ b/lib/rails/generators/installer.rb
@@ -0,0 +1,8 @@
+say "Copying application_mailbox.rb to app/mailboxes"
+copy_file "#{__dir__}/mailbox/templates/application_mailbox.rb", "app/mailboxes/application_mailbox.rb"
+
+environment <<~end_of_config, env: 'production'
+  # Prepare the ingress controller used to receive mail
+  # config.action_mailbox.ingress = :amazon
+
+end_of_config