Use hatchling as the build backend, this seems to make less problems

extras/docker/demo/Dockerfile

@@ -89,7 +89,7 @@ RUN python3 -m venv /home/wger/venv
 RUN . /home/wger/venv/bin/activate \
     && pip install --upgrade pip \
     && pip install --no-cache /wheels/* \
-    && pip install . \
+    && pip install -e . \
     && wger create-settings --database-path /home/wger/db/database.sqlite \
     && wger bootstrap \
     && wger load-online-fixtures \

extras/docker/development/Dockerfile

@@ -66,7 +66,7 @@ RUN chmod +x /home/wger/entrypoint.sh \
     && chown -R wger:wger .
 
 USER wger
-RUN pip3 install . \
+RUN pip3 install -e . \
     && mkdir ~/media \
     && mkdir ~/static \
     && mkdir ~/beat \

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["setuptools>=61.2"]
-build-backend = "setuptools.build_meta"
+requires = ["hatchling"]
+build-backend = "hatchling.build"
 
 [project]
 name = "wger"