adding precommit check (#930)

* adding precommit check

* run precommit

* Apply suggestions from code review

Co-authored-by: Zvi Baratz <z.baratz@gmail.com>

* apply precommit

---------

Co-authored-by: Zvi Baratz <z.baratz@gmail.com>

.github/workflows/pre-commit.yml

@@ -0,0 +1,26 @@
+name: Code formatting
+
+# see: https://help.github.com/en/actions/reference/events-that-trigger-workflows
+on:  # Trigger the workflow on push or pull request, but only for the main branch
+  push:
+    branches: [main]
+  pull_request: {}
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+
+  pre-commit-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+      - name: Set $PY environment variable
+        run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
+      - uses: actions/cache@v3
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
+      - uses: pre-commit/action@v3.0.0