CI: add spellcheck github action
action is self consistent. it is scheduled to run weekly
diff --git a/.github/workflows/codespell.yml b/.github/workflows/codespell.yml
new file mode 100644
index 0000000..e70de5e
--- /dev/null
+++ b/.github/workflows/codespell.yml
@@ -0,0 +1,17 @@
+name: codespell
+
+on:
+ schedule:
+ - cron: "0 0 * * 2"
+
+jobs:
+ codespell:
+
+ runs-on: ubuntu-latest
+
+ steps:
+ - uses: actions/checkout@v2
+ - name: install prerequisites
+ run: sudo pip install codespell
+ - name: check
+ run: codespell -c -q 2 --ignore-words-list ist,hist,wan,ca,cas --skip CHANGELOG