Build webassets on docker build

Dockerfile

@@ -15,6 +15,8 @@ RUN pip3 install -r requirements.txt
 
 ADD . .
 
+RUN ./manage.py assets build
+
 CMD nginx; gunicorn -b 0.0.0.0:5000 wsgi:app --workers 3
 
 EXPOSE 5000

manage.py

@@ -3,6 +3,7 @@
 import binascii
 import unittest
 
+from flask_assets import ManageAssets
 from flask_rq import get_worker
 from flask_script import Manager, Server, Command
 from flask_script.commands import ShowUrls, Clean
@@ -11,7 +12,7 @@
 
 from server import create_app, generate
 from server.models import db, User, Course, Version
-from server.extensions import cache
+from server.extensions import assets_env, cache
 
 # default to dev config
 env = os.environ.get('OK_ENV', 'dev')
@@ -33,6 +34,7 @@ def run(self):
 manager.add_command("clean", Clean())
 manager.add_command('db', MigrateCommand)
 manager.add_command('test', RunTests())
+manager.add_command("assets", ManageAssets(assets_env))
 
 @manager.shell
 def make_shell_context():