CI: add codespell

Reviewed-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lists.sr.ht/~postmarketos/pmbootstrap-devel/%3C20230706211537.10438-3-ollieparanoid@postmarketos.org%3E

.build.yml

@@ -15,6 +15,9 @@ tasks:
   - vermin: |
       cd pmbootstrap
       sudo .ci/vermin.sh
+  - codespell: |
+      cd pmbootstrap
+      sudo .ci/codespell.sh
   - pytest: |
       cd pmbootstrap
       sudo .ci/pytest.sh

.ci/codespell.sh

@@ -0,0 +1,20 @@
+#!/bin/sh -ex
+# SPDX-License-Identifier: GPL-3.0-or-later
+# Copyright 2023 Oliver Smith
+# Description: find typos
+# https://postmarketos.org/pmb-ci
+
+if [ "$(id -u)" = 0 ]; then
+	set -x
+	apk -q add \
+		py3-codespell
+	exec su "${TESTUSER:-build}" -c "sh -e $0"
+fi
+
+set -x
+
+# -L: words to ignore
+codespell \
+	-L crate \
+	-L hda \
+	.