ci: Enable ci, release, and review workflows in merge queues.

.github/workflows/auto-review.yml

@@ -2,6 +2,7 @@
 # merge, which means that I need a bot to review my own work.
 name: Automatic pull request approvals
 on:
+  merge_group:
   pull_request_target:
     types:
       - opened

.github/workflows/ci.yml

@@ -6,6 +6,7 @@ on:
     branches:
       - main
   pull_request:
+  merge_group:
 env:
   GOPROXY: "https://proxy.golang.org"
 

.github/workflows/release.yml

@@ -1,7 +1,8 @@
 name: release
 on:
-  # Test that it works on pull_request; goreleaser goes into snapshot mode if not a tag.
+  # Test that it works on pull_request or merge group; goreleaser goes into snapshot mode if not a tag.
   pull_request:
+  merge_group:
   push:
     tags:
       - v*