add pre-commit workflow for whitespace checking

Author: jimustafa

.github/workflows/main.yaml

@@ -0,0 +1,11 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - uses: pre-commit/[email protected]

.pre-commit-config.yaml

@@ -0,0 +1,15 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+        files: (?x)^(
+          [\w-]+[.]tex|
+          scripts/[\w-]+[.]py|
+          )$
+      - id: trailing-whitespace
+        files: (?x)^(
+          [\w-]+[.]tex|
+          scripts/[\w-]+[.]py|
+          )$