GA: Support "[skip ci]" and "[ci skip]" tags

.github/workflows/tests.yml

@@ -7,12 +7,15 @@ on:
 jobs:
   linux_tests:
     runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
 
     strategy:
       fail-fast: true
       matrix:
         php: [7.1, 7.2, 7.3, 7.4, 8.0]
 
+    name: PHP ${{matrix.php}}/Linux
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v2