accepts `.all` as a hook scope as well

app/models/concerns/triggerable_hooks.rb

@@ -18,7 +18,8 @@ module TriggerableHooks
     attr_reader :triggerable_hooks
 
     def hooks_for(trigger)
-      return none unless self::TRIGGERS.keys.include?(trigger)
+      callable_scopes = self::TRIGGERS.keys + [:all]
+      return none unless callable_scopes.include?(trigger)
 
       public_send(trigger) # rubocop:disable GitlabSecurity/PublicSend
     end

spec/models/concerns/triggerable_hooks_spec.rb

@@ -26,10 +26,18 @@ RSpec.describe TriggerableHooks do
 
     context 'the model does not have the required trigger scope' do
       it 'returns an empty relation' do
-        TestableHook.create!(url: 'http://example.com', push_events: true)
+        TestableHook.create!(url: 'http://example.com')
 
         expect(TestableHook.hooks_for(:tag_push_hooks)).to eq []
       end
     end
+
+    context 'the stock scope ".all" is accepted' do
+      it 'returns the record' do
+        hook = TestableHook.create!(url: 'http://example.com')
+
+        expect(TestableHook.hooks_for(:all)).to eq [hook]
+      end
+    end
   end
 end