Webpack config prod/dev split

EDUCATOR-1448

Modifies paver webpack task to use production configuration in all
non-devstack environments, and a development config in devstack.

lms/envs/common.py

@@ -1801,6 +1801,7 @@ WEBPACK_LOADER = {
         'STATS_FILE': os.path.join(STATIC_ROOT, 'webpack-stats.json')
     }
 }
+WEBPACK_CONFIG_PATH = 'webpack.prod.config.js'
 
 ########################## DJANGO DEBUG TOOLBAR ###############################
 

lms/envs/devstack.py

@@ -112,6 +112,9 @@ REQUIRE_DEBUG = DEBUG
 
 PIPELINE_SASS_ARGUMENTS = '--debug-info'
 
+# Load development webpack donfiguration
+WEBPACK_CONFIG_PATH = 'webpack.dev.config.js'
+
 ########################### VERIFIED CERTIFICATES #################################
 
 FEATURES['AUTOMATIC_VERIFY_STUDENT_IDENTITY_FOR_TESTING'] = True