Github action to check for whitespace violations (#2328)

Co-authored-by: MatthewDaggitt <matthewdaggitt@gmail.com>

Author: andreasabel

.github/workflows/whitespace.yml

@@ -0,0 +1,20 @@
+name: Check whitespace
+on:
+  push:
+    branches:
+      - master
+      - experimental
+  pull_request:
+    branches:
+      - master
+      - experimental
+  merge_group:
+
+jobs:
+  check-whitespace:
+    runs-on: ubuntu-latest
+    steps:
+
+    - uses: actions/checkout@v4
+
+    - uses: andreasabel/fix-whitespace-action@v1