Trim trailing whitespace and test on CI (#104275)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

.github/CODEOWNERS

@@ -7,6 +7,9 @@
 # GitHub
 .github/**                    @ezio-melotti @hugovk
 
+# pre-commit
+.pre-commit-config.yaml       @hugovk @AlexWaygood
+
 # Build system
 configure*                    @erlend-aasland @corona10
 

.github/workflows/lint.yml

@@ -0,0 +1,22 @@
+name: Lint
+
+on: [push, pull_request, workflow_dispatch]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+      - uses: pre-commit/action@v3.0.0

.pre-commit-config.yaml

@@ -0,0 +1,7 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: check-yaml
+      - id: trailing-whitespace
+        types_or: [c, python, rst]