MAINT: Add to autofix.ci and make sure it works

Author: larsoner

.github/workflows/autofix.yml

@@ -0,0 +1,19 @@
+name: autofix.ci
+
+on: # yamllint disable-line rule:truthy
+  pull_request:
+    types: [opened, synchronize, labeled, unlabeled]
+
+permissions:
+  contents: read
+
+jobs:
+  autofix:
+    name: Autoupdate changelog entry and headers
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+      - run: ./codespell_lib/gen_OX.sh codespell_lib/data/dictionary_en-GB_to_en-US.txt > codespell_lib/data/dictionary_en_to_en-OX_AUTOGENERATED.txt
+      - uses: autofix-ci/action@635ffb0c9798bd160680f18fd73371e355b85f27