Add CI Action with Spell Check

Add ignore list for spell-checker

dev_requirements/requirements-spell_check.in

@@ -0,0 +1 @@
+codespell

dev_requirements/requirements-spell_check.txt

@@ -0,0 +1,8 @@
+#
+# This file is autogenerated by pip-compile with Python 3.11
+# by the following command:
+#
+#    pip-compile requirements-spellcheck.in
+#
+codespell==2.2.6
+    # via -r dev_requirements/requirements-spell_check.in

domain-specific-terms.txt

@@ -0,0 +1,11 @@
+bdew
+alle
+tage
+oder
+generell
+frist
+als
+beginn
+ist
+tages
+vor

tox.ini

@@ -67,3 +67,15 @@ deps =
 commands =
     python -m build
     twine check dist/*
+
+[testenv:spell_check]
+# the spellcheck environment checks the code for typos
+setenv = PYTHONPATH = {toxinidir}/src
+deps =
+    -r requirements.txt
+    -r dev_requirements/requirements-spell_check.txt
+commands =
+    codespell --ignore-words=domain-specific-terms.txt src/bdew_datetimes
+    codespell --ignore-words=domain-specific-terms.txt README.md
+    # add single files (ending with .py) or packages here
+    # note that domain-specific-terms.txt (the ignore list of the spell checker) has to contain the ignored words in all lower case