Implement CLI debug option

spec/producer/core/env_spec.rb

@@ -26,6 +26,10 @@ module Producer::Core
         expect(env.verbose).to be false
       end
 
+      it 'assigns debug as false' do
+        expect(env.debug).to be false
+      end
+
       it 'assigns dry run as false' do
         expect(env.dry_run).to be false
       end
@@ -168,6 +172,13 @@ module Producer::Core
       end
     end
 
+    describe '#debug?' do
+      it 'returns true when debug is enabled' do
+        env.debug = true
+        expect(env).to be_debug
+      end
+    end
+
     describe '#dry_run?' do
       it 'returns true when dry run is enabled' do
         env.dry_run = true