CI: Add job to check formatting

Author: dbaston

.github/workflows/code_checks.yml

@@ -0,0 +1,21 @@
+name: Code Checks
+
+on:
+    push:
+        paths-ignore:
+            - 'doc/**'
+    pull_request:
+        paths-ignore:
+            - 'doc/**'
+
+permissions:
+  contents: read
+
+jobs:
+
+  pre-commit-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+      - uses: pre-commit/action@v3.0.0