[ci,codespell] add workflow running codespell

scripts/codespell.ignore

@@ -0,0 +1,21 @@
+nin
+pres
+ptd
+statics
+inout
+ontext
+clen
+usera
+fom
+fle
+parm
+tolen
+psuh
+larg
+varn
+wight
+resizeable
+wan
+bre
+sur
+numer

scripts/codespell.sh

@@ -0,0 +1,15 @@
+#!/bin/bash -x
+
+SCRIPT_PATH=$(dirname "${BASH_SOURCE[0]}")
+SCRIPT_PATH=$(realpath "$SCRIPT_PATH")
+
+# ignore the following regular expressions:
+#
+# 1. All words consisting of only 2 characters (too many issues with variable names)
+# 2. Every word of the form 'pEvent', e.g. variable prefixed with p for pointer
+# 3. Every word prefixed by e.g. '\tSome text', e.g. format string escapes
+codespell \
+    -I "$SCRIPT_PATH/codespell.ignore" \
+    -S ".git,*.ai,*.svg,*.rtf,*/assets/de_*,*/res/values-*,*/protocols/xdg*,*/test/*" \
+    --ignore-regex "\b[a-zA-Z][a-zA-Z]\b|\bp[A-Z].*|\\\\[a-z][a-zA-Z].*" \
+    --count $SCRIPT_PATH/..