pre-commit: add missing checkout (#100)

commit-id:6803b49e

Author: dhalperi

.github/workflows/pre-commit.yml

@@ -8,4 +8,5 @@ jobs:
   build-and-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/jekyll-build-pages@v1.0.5
+      - uses: actions/checkout@v3
+      - uses: actions/jekyll-build-pages@v1