Add merge group triggers to CI

Author: benjeffery

.github/workflows/cd.yml

@@ -1,6 +1,7 @@
 name: CD
 
 on:
+  merge_group:
   push:
     branches:
       - main

.github/workflows/ci.yml

@@ -1,6 +1,7 @@
 name: CI
 
 on:
+  merge_group:
   pull_request:
   push:
     branches:

.github/workflows/docs.yml

@@ -1,6 +1,7 @@
 name: Docs
 
 on:
+  merge_group:
   pull_request:
   push:
     branches: