github: add codespell check

Signed-off-by: Christian Göttsche <[email protected]>

.github/workflows/lint-policy.yml

@@ -71,3 +71,17 @@ jobs:
 
     - name: Run file context checker
       run: python${{ inputs.python-version }} -t -t -E -W error testing/check_fc_files.py
+
+  codespell:
+   runs-on: ubuntu-22.04
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update -q
+        sudo apt-get install -qy codespell
+
+    - name: Run codespell
+      run: codespell --skip Changelog,Changelog.contrib,Changelog.old --ignore-words-list busses,chage,doesnt,lik,nd,racoon,shouldnt,startd,te,thats,xwindows --context 1 .