CI 'ci skip' check

.github/workflows/main.yml

@@ -8,8 +8,13 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 jobs:
-  test:
+  check_skip:
+    runs-on: ubuntu-latest
+    if: "! contains(github.event.head_commit.message, '[ci skip]')"
+    steps:
+      - run: echo "${{ github.event.head_commit.message }}"
 
+  test:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false