chore: use head commit for skip tests on docs

.github/workflows/ci.yml

@@ -46,7 +46,7 @@ jobs:
     name: Check Python ${{ matrix.python-version }} on ${{ matrix.runs-on }}
     runs-on: ${{ matrix.runs-on }}
     # don't run tests if any commits in push contain "docs:" or "style:"
-    if: "!contains(github.push.commits.message, 'docs:')" #&& !contains(github.push.commits.message, 'style:')  }}
+    if: "!contains(github.event.head_commit.message, 'docs:')" #&& !contains(github.push.commits.message, 'style:')  }}
     needs: [pre-commit]
     strategy:
       # Otherwise, the workflow would stop if a single job fails. We want to