Merge branch 'main' into cleanup

.github/workflows/check_indentation.yml

@@ -31,6 +31,7 @@ name: t8code indentation check
 # The output is uploaded as an artifact to the github page.
 
 on:
+  merge_group:
   push:
     branches:
       - main

.github/workflows/spell_check.yml

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

.github/workflows/tests_cmake_testsuite.yml

@@ -31,6 +31,7 @@ name: t8code CMake testsuite
 #       IGNORE_CACHE to true in the respective steps.
 
 on:
+  merge_group:
   push:
     branches:
       - main