Add codecov (#6967)

* add codecov upload

* add to readme

* add flags

* dummy change

* dummy change

* switch to inventree org

* add codecov yaml

* lower threshold (for now)
see https://github.com/inventree/InvenTree/pull/6945 for a possibility to get it up again

src/backend/InvenTree/InvenTree/urls.py

@@ -385,6 +385,7 @@ if settings.ENABLE_CLASSIC_FRONTEND:
 
 classic_frontendpatterns = [
     # Apps
+    #
     path('build/', include(build_urls)),
     path('common/', include(common_urls)),
     path('company/', include(company_urls)),

src/frontend/src/main.tsx

@@ -30,6 +30,7 @@ let loaded_vals = (window.INVENTREE_SETTINGS || {}) as any;
 Object.keys(loaded_vals).forEach((key) => {
   if (loaded_vals[key] === undefined) {
     delete loaded_vals[key];
+
     // check for empty server list
   } else if (key === 'server_list' && loaded_vals[key].length === 0) {
     delete loaded_vals[key];