Allow type to be specified by ENV only

While we can override the warren type, we still needed it
included in the warren.yml. This was especially annoying when
trying to build assets or similar on the CI.

Note: This does not default to 'log' to avoid silent failures.

CHANGELOG.md

@@ -5,6 +5,10 @@ Unreleased section to make new releases easy.
 
 ## [Unreleased]
 
+### Changed
+
+- The WARREN_TYPE environmental variable can now fully replace the config yaml
+
 ## [0.4.1] - 2022-01-04
 
 ### Changed

lib/warren.rb

@@ -29,7 +29,7 @@ module Warren
   #
   # @return [Warren::Handler::Base] Exact class determined by the type passed in
   #
-  def self.construct(type:, config: {})
+  def self.construct(type: 'UNSPECIFIED', config: {})
     warren_type = ENV.fetch(WARREN_TYPE, type)
     case warren_type
     when 'test' then Warren::Handler::Test.new

spec/warren/subscriber/base_spec.rb

@@ -74,7 +74,7 @@
         expect(subscription).to have_received(:ack).with('delivery_tag')
       end
 
-      it 'posts the  message to the delay exchange' do
+      it 'posts the message to the delay exchange' do
         expect(delayed).to have_received(:publish).with('Hello', routing_key: 'test.key', headers: { attempts: 1 })
       end
 
@@ -91,7 +91,7 @@
         expect(subscription).to have_received(:nack).with('delivery_tag')
       end
 
-      it 'does not post the  message to the delay exchange' do
+      it 'does not post the message to the delay exchange' do
         expect(delayed).not_to have_received(:publish)
       end