Check '[ci skip]' at job level

.github/workflows/macos.yml

@@ -13,6 +13,7 @@ jobs:
       matrix:
         test_task: [ "check", "test-bundler", "test-bundled-gems" ]
       fail-fast: false
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
       - name: Disable Firewall
         run: |

.github/workflows/ubuntu.yml

@@ -13,6 +13,7 @@ jobs:
       matrix:
         test_task: [ "check", "test-bundler", "test-bundled-gems" ]
       fail-fast: false
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
       - run: env | sort
       - name: Dump GitHub context

.github/workflows/windows.yml

@@ -20,6 +20,7 @@ jobs:
             vs: 2017
       fail-fast: false
     runs-on: ${{ matrix.os }}
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
       - name: Install libraries with vcpkg
         run: |