Add test extensions as trigger

Author: crazywhalecc

.github/workflows/ext-matrix-tests.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     name: "${{ matrix.extension }} (PHP ${{ matrix.php-version }} on ${{ matrix.operating-system }})"
     runs-on: ${{ matrix.operating-system }}
-    if: contains(github.event.head_commit.message, 'extension test')
+    if: contains(github.event.head_commit.message, 'extension test') || contains(github.event.head_commit.message, 'test extensions')
     strategy:
       fail-fast: false
       matrix: