Add GitHub Actions CI workflow for pre-commit checks with Python 3.12 setup

Author: FridrichMethod

.github/workflows/ci.yml

@@ -0,0 +1,16 @@
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - uses: pre-commit/action@v3.0.1