ci: add merge group as test trigger

Signed-off-by: Michael Beemer <beeme1mr@users.noreply.github.com>

Author: beeme1mr

.github/workflows/pr-test.yml

@@ -4,6 +4,7 @@ on:
     branches:
       - main
   pull_request:
+  merge_group:
 
 permissions:
   contents: read
@@ -30,4 +31,4 @@ jobs:
             ${{ runner.os }}-go-
 
       - name: Run tests
-        run: go test ./...
+        run: go test ./...