ci: add workflow for codespell

Add a simple workflow to run codespell as part of the checks for every
PR.

Signed-off-by: Pino Toscano <[email protected]>

.github/workflows/codespell.yml

@@ -0,0 +1,14 @@
+name: codespell
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  codespell:
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: codespell-project/actions-codespell@v2