add merge_group action trigger (#5132)

Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>

.github/workflows/checks.yml

@@ -4,6 +4,7 @@ on:
     branches: [ main ]
   pull_request:
   workflow_dispatch:
+  merge_group:
 
 jobs:
   spotless:

.github/workflows/codeql.yml

@@ -21,6 +21,7 @@ on:
       - '**/*.md'
       - '**/*.properties'
       - '**/*.txt'
+  merge_group:
 jobs:
   analyze:
     name: Analyze

.github/workflows/dco.yml

@@ -2,6 +2,7 @@ name: dco
 on:
   pull_request:
   workflow_dispatch:
+  merge_group:
 
 jobs:
   dco:

.github/workflows/gradle-wrapper-validation.yml

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 name: "Validate Gradle Wrapper"
-on: [push, pull_request]
+on: [push, pull_request, merge_group]
 
 jobs:
   validation:

.github/workflows/repolinter.yml

@@ -12,6 +12,7 @@ on:
     branches:
       - master
       - main
+  merge_group:
 
 jobs:
   build: