Add pre-commit black hook and CI job

Author: honno

.github/workflows/lint.yml

@@ -0,0 +1,20 @@
+name: Linting
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.8]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Run pre-commit hook
+      uses: pre-commit/[email protected]

.pre-commit-config.yaml

@@ -0,0 +1,6 @@
+repos:
+- repo: https://github.com/psf/black
+  rev: 22.12.0
+  hooks:
+  - id: black
+    exclude: ^torch_np/tests/numpy_tests/