ci(yaml): fix workflow job trigger event error

.github/workflows/ci.yml

@@ -8,27 +8,30 @@ on:
 jobs:
   check-commit:
     runs-on: ubuntu-latest
-    if: ${{ github.event.pull_request }}
     steps:
       - uses: actions/checkout@v2.3.1
         with:
           fetch-depth: 0
       - uses: actions/setup-node@v2.1.0
-      - run: yarn add @commitlint/config-conventional @commitlint/cli
-      - run: yarn commitlint --from ${{ github.event.pull_request.base.sha }} --to HEAD
+      - name: Check commit
+        if: ${{ github.event.pull_request }}
+        run: |
+          yarn add @commitlint/config-conventional @commitlint/cli
+          yarn commitlint --from ${{ github.event.pull_request.base.sha }} --to HEAD
 
   check-format:
     runs-on: ubuntu-latest
-    if: ${{ github.event.pull_request }}
     steps:
       - uses: actions/checkout@v2.3.1
         with:
           fetch-depth: 0
       - name: Set up Python
+        if: ${{ github.event.pull_request }}
         uses: actions/setup-python@v2
         with:
           python-version: 3.6
       - name: Cache pip
+        if: ${{ github.event.pull_request }}
         uses: actions/cache@v2
         with:
           # This path is specific to Ubuntu
@@ -39,9 +42,11 @@ jobs:
             ${{ runner.os }}-pip-
             ${{ runner.os }}-
       - name: Install dependencies
+        if: ${{ github.event.pull_request }}
         run: |
           python -m pip install --upgrade pip
       - name: Check format
+        if: ${{ github.event.pull_request }}
         run: |
           ./ci/run_format_check.sh