Remove submodules from actions, and enable more pre-commits (#1051)

.github/workflows/pre-commit.yaml

@@ -14,9 +14,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-        with:
-          submodules: true
       - uses: actions/setup-python@v2
       - uses: pre-commit/action@v2.0.2
         env:
-          SKIP: bazel-buildifier,clang-format-whole-file,fix-cc-deps
+          # bazel-buildifier relies on a locally installed copy.
+          # clang-format-whole-file has races in cache creation.
+          SKIP: bazel-buildifier,clang-format-whole-file

.github/workflows/tests.yaml

@@ -39,13 +39,10 @@ jobs:
         uses: actions/checkout@v2
         with:
           ref: ${{ github.event.pull_request.head.sha }}
-          submodules: true
 
       - name: Checkout branch
         if: github.event_name != 'pull_request_target'
         uses: actions/checkout@v2
-        with:
-          submodules: true
 
       # Setup Python and related tools.
       - uses: actions/setup-python@v2