Fix missing bundle static assets in dev mode

The static assets need to be properly collected in the development image
in order to have a working webpack-stats.json file.

The /openedx/staticfiles folder is still bind-mounted in the docker
image in order to have a working `watchthemes` command.

This is for issue #235, again.

tutor/templates/build/openedx-dev/Dockerfile

@@ -10,6 +10,13 @@ RUN apt update && \
 RUN pip install -r requirements/edx/development.txt
 RUN pip install ipdb==0.12.2 ipython==5.8.0
 
+# Recompile static assets: in development mode all static assets are stored in edx-platform,
+# and the location of these files is stored in webpack-stats.json. If we don't recompile
+# static assets, then production assets will be served instead.
+RUN rm -r /openedx/staticfiles && \
+    mkdir /openedx/staticfiles && \
+    openedx-assets webpack --env=dev
+
 # Copy new entrypoint (to take care of permission issues at runtime)
 COPY ./bin /openedx/bin
 RUN chmod a+x /openedx/bin/*
@@ -20,5 +27,3 @@ RUN create-user.sh $USERID
 
 # Default django settings
 ENV SETTINGS tutor.development
-
-# TODO recompile static assets and point to edx-platform

tutor/templates/dev/docker-compose.yml

@@ -5,8 +5,6 @@ services:
     &openedx-service
     image: {{ DOCKER_REGISTRY }}{{ DOCKER_IMAGE_OPENEDX_DEV }}
     volumes:
-      # static assets
-      - ../../data/openedx/staticfiles:/openedx/staticfiles
       # theme files
       - ../build/openedx/themes:/openedx/themes
       # editable requirements
@@ -25,5 +23,6 @@ services:
   watchthemes:
     <<: *openedx-service
     command: openedx-assets watch-themes --env dev
+    restart: unless-stopped
   
   {{ patch("local-docker-compose-dev-services")|indent(2) }}